F22_RaptoR
CGN Ultra frequent flyer
- Location
- Edmonton, Alberta
Im not sure about the 16" one, but actually I think a 11 or 12" barrel would look awesome on the USC. Although with a flash hider sticking out just a bit, the 8" looks pretty darn sweet!
HK USC to UMP conversion
- Thread starter Moparlover
- Start date
Im not sure about the 16" one, but actually I think a 11 or 12" barrel would look awesome on the USC. Although with a flash hider sticking out just a bit, the 8" looks pretty darn sweet!
I've seen a flat-top Beretta Storm. I would presume that cutting the sights off on the USC/UMP would take similar effort. Except someone would claim it's "bubba'd" and the resale value would plummet.
Im not sure about the 16" one, but actually I think a 11 or 12" barrel would look awesome on the USC. Although with a flash hider sticking out just a bit, the 8" looks pretty darn sweet!
I dunno. The original UMP barrel just looks like someone roughly squared it off with front hand guard and sliced it off.
F22_RaptoR
CGN Ultra frequent flyer
- Location
- Edmonton, Alberta
I guess its just sposed to be short, you don't get much velocity increase with pistol rounds and a longer barrel. it does stick out about an inch past the front handguard, although it does look much better with a flash hider of some sort:
(gratuitous post whoring pic)
ETA
I've seen a guy (on HKpro I think, maybe even one guy here? i forget... too many darned forums!) do the flat top thing. Looked REALLY good actually!
The USC sights are not all that great, so having the ability to have flip-ups and a main optic would be a big advantage. In fact I would even be tempted to do it if I hadn't epoxied the shorty top rail on mine!
Moparlover
CGN frequent flyer
love the look of it raptor. i think the round holes look better than the factory sloted holes. if i might offer you a suggestion, fabsports had a piece that allowed the collapsible stock to also fold to the side to make it even more compact. i have one on a ruger charger project and is solid, works well. HK bullets, lol.
F22_RaptoR
CGN Ultra frequent flyer
- Location
- Edmonton, Alberta
Cant post a pic without the rounds loaded backwards now
I was actually thinking about getting one of those folding stock adapters, another Idea I had was to get a piece of steel or something and epoxy it into the buffer tube (as an anchor point for screws) so It doesn't have to be quite as long.
The 1/2 inch holes are definitely my favorite look-wise thing about it!
A more updated pic of her (just a quick pic on my bed)
The 1/4" cheek riser is a little nicer for the Micro, and the Surefire X300 is MUCH nicer than the 6P LED Defender (much brighter, and more concentrated beam at the center and a good flood)
Haha, and forgot about the magazine clamp! None of the US places would ship up here, so I said fuggit and made my own
. Definitely not cheaper than in the US, but its pretty solid so-far. Made from Shapeways with selective laser sintered plastic (a very flexible and strong plastic, its actually quite durable from my experience so far, although not too sure how it withstands shock forces)
- Location
- Southern ON.
I'm trying to decide if I want to do the vent slots. Not sure if the non vented look fits better with the A2 stock. What are the chances of the upper cracking during the milling process?
TheGamerXxX
CGN frequent flyer
- Location
- North of the 49, Manitoba
*Drool*
Now we need a MP5 ripoff-kit
Luke
Now we need a MP5 ripoff-kit
Luke
The nylon that HK uses is not brittle in standard conditions. The chances of it cracking are approaching zero. And if they crack, it can be welded back together to fix.
- Location
- Southern ON.
I have heated, melted, bent, cut, filed and sanded the nylon from my HK. I thought the same as you. It kind of threw me off when the smith warned that there was a chance that the receiver could crack when cutting the vents. I think it's just a "cover his ass" comment.
But, the important question still remains:
To vent or not to vent?
That would probably be the best explanation. As to venting or not, it is up to you, and aside from the OEM HK vents and the vents graciously demonstrated by F22_RaptoR, another style to consider may be the slanted vents on the Tavor. Three at 45 degree down and back on the sides, and three in herringbone towards the front on the bottom maybe? I'll try to draw what I mean if it's not clear, but they would probably have to be scaled down from the Tavor. Also the AG36 venting might be of interest, scaled down as well, in a brick pattern of four vents on each side.
F22_RaptoR
CGN Ultra frequent flyer
- Location
- Edmonton, Alberta
The HK style vents are the simplest (in fact the small hole in the bottom of the handguard just in front of the REAR metal stud, is exactly the right location and profile for the rear radius of the vent)
These are the specs I found for the factory HK vents
http://w w w.ump45.com/Slots.htm
You CAN do it with a drill bit and a dremel (drill the front and back holes for each vent slot, and then dremel the middle flat sections out). Just leave room for clearance and for filing it down a lot.
Or you can drag it to a machine shop and have the guy use a mill to cut them out.
The thing about doing fancy stuff like the 45 degree cuts (although it would look pretty sweet!) is getting the profile right and the same.
If I were gonna do 45 degree cuts, I would print it out to scale on a printer on sticky backed paper, then stick it on the handguard and use it as a template (or you could use normal paper and tape it on both sides). Just use a few drill bits and a dremel with a small rotary grinding stone.
And don't worry about the plastic 'cracking' at all. I've done a ton of stuff to my USC and my mark23 handgun without the plastic doing anything wonky. Its MUCH more likely to deform if a drill bit augers in too fast.
These are the specs I found for the factory HK vents
http://w w w.ump45.com/Slots.htm
You CAN do it with a drill bit and a dremel (drill the front and back holes for each vent slot, and then dremel the middle flat sections out). Just leave room for clearance and for filing it down a lot.
Or you can drag it to a machine shop and have the guy use a mill to cut them out.
The thing about doing fancy stuff like the 45 degree cuts (although it would look pretty sweet!) is getting the profile right and the same.
If I were gonna do 45 degree cuts, I would print it out to scale on a printer on sticky backed paper, then stick it on the handguard and use it as a template (or you could use normal paper and tape it on both sides). Just use a few drill bits and a dremel with a small rotary grinding stone.
And don't worry about the plastic 'cracking' at all. I've done a ton of stuff to my USC and my mark23 handgun without the plastic doing anything wonky. Its MUCH more likely to deform if a drill bit augers in too fast.
- Location
- Southern ON.
Keeping with the tradition of informative HK posts here is some info.
INFO
The USC
Derived from the HK UMP, the USC is a civilian utility carbine that uses the classic hard-hitting .45 ACP cartridge. Matched with the simple and ultra-reliable blowback operating system, the HK USC is a radical departure from traditional firearms designs. Extensive use of the same durable, reinforced polymers used on HK’s line of military and police arms ensures lightweight and durability. And the highest grade of weapons steel is used where it matters—in the cold hammer forged target barrel and the solidly constructed bolt mechanism. User ergonomics are not sacrificed. The skeletonized buttstock is topped with a comfortable rubber cheek rest and recoil pad. The web of the pistol grip is open for a comfortable shooting handhold. Hard points located on the top and front of the receiver make attachment of optional Picatinny rails easy, allowing almost any kind of sighting system or accessory to be mounted.
Classification:
Restricted by barrel length
Caliber:
.45 ACP
Principle of operation:
Blowback
Weight:
Without Magazine 4.2 kg/ 6.00 lb
Dimensions:
Overall length 900 mm/ 35.43 in.
Barrel length 400 mm/ 16.13 in.
Sight Radius 327 mm/ 12.87 in
Other Specifications :
Magazine capacity 5/10 rounds
Trigger Pull approx. 20 N
Sights adjustable
Features:
•Tough, light weight, corrosion proof polymer construction
•Molded-in hard points for mounting accessories
•Accessory Picatinny rails for easy mounting of optical sights, lights, and aiming devices
•Rear sight is adjustable for windage and elevation
•Easy disassembly for simple cleaning and maintenance
•Ambidextrous safety/selector lever
•Open, skeletonized buttstock for better grip
•Oversized trigger guard for easy operation while wearing gloves
•Sixteen inch cold-hammer forged target barrel
•Rubber cheek rest and buttstock recoil pad
•Polymer 5/10-round magazine
•Lifetime warranty
Stock Conversions
Click on pic for larger view
HERA arms (Available: PM member Blaxsun)
HDPS Stock Block B(Available: HDPS, HK Parts Net)
Also requires new UMP lower and stock
HDPA stock block C (Available: HDPS, HK Parts Net)
Also requires new UMP lower and AR style stock
Top notch parts (Available HK parts net)
Mags
HK USC(available: wolverine supply and other HK retailers)
HERA USC extended mags (Available: PM member Blaxsun)
Rails
HK (Available: wolverine supply and other HK retailers)
HERA (Available: PM member Blaxsun)
HDPS (Available: HK parts Net)
Top rail, Side/bottom rail
Dlask (Available: Dlask Arms)
Custom Barrels
If you want a custom length barrel made you can contact one of the following:
Ellwood Epps
Bits of Pieces
Dlask Arms
Fake Can/Supressor
HDPS (Available: HK parts net)
For 16" barrel
Parts List and #s
x.......Uper receiver w/ barrel, comp (1-21)...n/a
1.......upper receiver.................................219 492
2.......front sight......................................217 506
3.......roll pin, front sight,4x144mm..............928 747
x.......rear sight, comp (4-10)....................217 513
4.......sight support..................................217 992
5.......flat spring......................................217 515
6.......rear sight.......................................217 516
7.......windage adjustment screw................217 517
8.......rear sight spring..............................217 518
9.......sight support spring.........................217 504
10.....elevation adjustment screw...............217 505
11.....roll pin, sight support 4x30mm............987 695
12.....cocking lever..................................217 519
13.....cocking lever spring.........................217 508
14.....cocking lever support.......................217 507
15.....roll pin, cocking lever support 4x16mm.986 546
16.....barrel .45 acp.................................219 497
17.....roll pin, barrel, 6x32mm.....................988 425
18.....ejector..........................................219 399
x.......hand stop, comp (19-21)..................219 364
19.....hand stop......................................219 342
20.....insert plate, handstop......................219 343
21.....Cylindrical screw, handstop,5x16mm....217 414
x.......buttstock, comp (22-23 USC)............219 496
22.....buttstock.......................................217 528
23.....buffer............................................217 544
x.......bolt, complete,.45 ACP.....................219 495
24.....bolt 45 ACP....................................219 499
25.....extractor 45 ACP.............................217 537
26.....firing pin assembly, comp..................217 555
27.....firing pin spring...............................217 523
28.....firing pin retaining pin.......................217 587
29.....recoil spring assembly, comp..............217 548
x.......lower receiver, comp (30-56 USC)......219 487
30.....lower receiver.................................219 491
31.....trigger...........................................205 420
32.....trigger spring..................................217 918
33.....axle 3X..........................................217 532
34.....sear..............................................205 439
35.....sear spring.....................................217 917
x.......locking lever, comp..........................219 094
36.....locking lever spring..........................214 616
37.....locking lever...................................219 095
38.....bolt...............................................214 615
39.....elbow spring right............................217 496
40.....elbow spring left..............................205 201
41.....hammer.........................................217 936
42.....hammer spring left...........................217 533
43.....hammer spring right..........................217 585
44.....notched disk...................................217 614
45.....compression spring...........................205 418
46.....index plate.....................................205 419
47.....axle, locking lever............................219 521
49.....safety lever left..............................217 945
50.....safety lever right.............................205 437
51.....magazine release.............................219 530
52.....magazine release spring....................217 536
53.....magazine release axle.......................219 549
54.....bolt catch......................................217 540
55.....bolt catch spring.............................217 539
56.....roll pin, bolt catch...........................928 080
57.....allen screw, buttstock......................217 903
x.......magazine, comp 45ACP (58-62 USC)...219 486
58.....magazine housing............................219 522
59.....follower.........................................219 523
60.....magazine spring..............................219 524
61.....locking plate...................................219 525
62.....floor plate......................................219 526
x.......picatinny rail short comp w/ screws....219 662
63.....picatinny rail, short..........................219 660
64.....cylindrical screw 2x (M5x0.8)............219 413
x.......picatinny rail, long, complete.............219 663
65.....picatinny rail, long...........................219 661
66.....cylindrical screw 2x (M5x0.8)............219 413
x.......HK tool..........................................988 496
67.....carrying sling, comp.........................219 085
INFO
The USC
Derived from the HK UMP, the USC is a civilian utility carbine that uses the classic hard-hitting .45 ACP cartridge. Matched with the simple and ultra-reliable blowback operating system, the HK USC is a radical departure from traditional firearms designs. Extensive use of the same durable, reinforced polymers used on HK’s line of military and police arms ensures lightweight and durability. And the highest grade of weapons steel is used where it matters—in the cold hammer forged target barrel and the solidly constructed bolt mechanism. User ergonomics are not sacrificed. The skeletonized buttstock is topped with a comfortable rubber cheek rest and recoil pad. The web of the pistol grip is open for a comfortable shooting handhold. Hard points located on the top and front of the receiver make attachment of optional Picatinny rails easy, allowing almost any kind of sighting system or accessory to be mounted.
Classification:
Restricted by barrel length
Caliber:
.45 ACP
Principle of operation:
Blowback
Weight:
Without Magazine 4.2 kg/ 6.00 lb
Dimensions:
Overall length 900 mm/ 35.43 in.
Barrel length 400 mm/ 16.13 in.
Sight Radius 327 mm/ 12.87 in
Other Specifications :
Magazine capacity 5/10 rounds
Trigger Pull approx. 20 N
Sights adjustable
Features:
•Tough, light weight, corrosion proof polymer construction
•Molded-in hard points for mounting accessories
•Accessory Picatinny rails for easy mounting of optical sights, lights, and aiming devices
•Rear sight is adjustable for windage and elevation
•Easy disassembly for simple cleaning and maintenance
•Ambidextrous safety/selector lever
•Open, skeletonized buttstock for better grip
•Oversized trigger guard for easy operation while wearing gloves
•Sixteen inch cold-hammer forged target barrel
•Rubber cheek rest and buttstock recoil pad
•Polymer 5/10-round magazine
•Lifetime warranty
Stock Conversions
Click on pic for larger view
HERA arms (Available: PM member Blaxsun)
HDPS Stock Block B(Available: HDPS, HK Parts Net)
Also requires new UMP lower and stock
HDPA stock block C (Available: HDPS, HK Parts Net)
Also requires new UMP lower and AR style stock
Top notch parts (Available HK parts net)
Mags
HK USC(available: wolverine supply and other HK retailers)
HERA USC extended mags (Available: PM member Blaxsun)
Rails
HK (Available: wolverine supply and other HK retailers)
HERA (Available: PM member Blaxsun)
HDPS (Available: HK parts Net)
Top rail, Side/bottom rail
Dlask (Available: Dlask Arms)
Custom Barrels
If you want a custom length barrel made you can contact one of the following:
Ellwood Epps
Bits of Pieces
Dlask Arms
Fake Can/Supressor
HDPS (Available: HK parts net)
For 16" barrel
Parts List and #s
x.......Uper receiver w/ barrel, comp (1-21)...n/a
1.......upper receiver.................................219 492
2.......front sight......................................217 506
3.......roll pin, front sight,4x144mm..............928 747
x.......rear sight, comp (4-10)....................217 513
4.......sight support..................................217 992
5.......flat spring......................................217 515
6.......rear sight.......................................217 516
7.......windage adjustment screw................217 517
8.......rear sight spring..............................217 518
9.......sight support spring.........................217 504
10.....elevation adjustment screw...............217 505
11.....roll pin, sight support 4x30mm............987 695
12.....cocking lever..................................217 519
13.....cocking lever spring.........................217 508
14.....cocking lever support.......................217 507
15.....roll pin, cocking lever support 4x16mm.986 546
16.....barrel .45 acp.................................219 497
17.....roll pin, barrel, 6x32mm.....................988 425
18.....ejector..........................................219 399
x.......hand stop, comp (19-21)..................219 364
19.....hand stop......................................219 342
20.....insert plate, handstop......................219 343
21.....Cylindrical screw, handstop,5x16mm....217 414
x.......buttstock, comp (22-23 USC)............219 496
22.....buttstock.......................................217 528
23.....buffer............................................217 544
x.......bolt, complete,.45 ACP.....................219 495
24.....bolt 45 ACP....................................219 499
25.....extractor 45 ACP.............................217 537
26.....firing pin assembly, comp..................217 555
27.....firing pin spring...............................217 523
28.....firing pin retaining pin.......................217 587
29.....recoil spring assembly, comp..............217 548
x.......lower receiver, comp (30-56 USC)......219 487
30.....lower receiver.................................219 491
31.....trigger...........................................205 420
32.....trigger spring..................................217 918
33.....axle 3X..........................................217 532
34.....sear..............................................205 439
35.....sear spring.....................................217 917
x.......locking lever, comp..........................219 094
36.....locking lever spring..........................214 616
37.....locking lever...................................219 095
38.....bolt...............................................214 615
39.....elbow spring right............................217 496
40.....elbow spring left..............................205 201
41.....hammer.........................................217 936
42.....hammer spring left...........................217 533
43.....hammer spring right..........................217 585
44.....notched disk...................................217 614
45.....compression spring...........................205 418
46.....index plate.....................................205 419
47.....axle, locking lever............................219 521
49.....safety lever left..............................217 945
50.....safety lever right.............................205 437
51.....magazine release.............................219 530
52.....magazine release spring....................217 536
53.....magazine release axle.......................219 549
54.....bolt catch......................................217 540
55.....bolt catch spring.............................217 539
56.....roll pin, bolt catch...........................928 080
57.....allen screw, buttstock......................217 903
x.......magazine, comp 45ACP (58-62 USC)...219 486
58.....magazine housing............................219 522
59.....follower.........................................219 523
60.....magazine spring..............................219 524
61.....locking plate...................................219 525
62.....floor plate......................................219 526
x.......picatinny rail short comp w/ screws....219 662
63.....picatinny rail, short..........................219 660
64.....cylindrical screw 2x (M5x0.8)............219 413
x.......picatinny rail, long, complete.............219 663
65.....picatinny rail, long...........................219 661
66.....cylindrical screw 2x (M5x0.8)............219 413
x.......HK tool..........................................988 496
67.....carrying sling, comp.........................219 085
Last edited:
I guess its just sposed to be short, you don't get much velocity increase with pistol rounds and a longer barrel. it does stick out about an inch past the front handguard, although it does look much better with a flash hider of some sort:
(gratuitous post whoring pic)
ETA
I've seen a guy (on HKpro I think, maybe even one guy here? i forget... too many darned forums!) do the flat top thing. Looked REALLY good actually!
The USC sights are not all that great, so having the ability to have flip-ups and a main optic would be a big advantage. In fact I would even be tempted to do it if I hadn't epoxied the shorty top rail on mine!
That looks like a nice gun, and very sturdy in appearance like an old battle rifle.
I'll still stick with the longer barrel looking good, since unlike the US-complaint Uzi carbine, where the barrel looks out of place, the HK USC looks like it would appear complete with a whole manner of barrel lengths.
F22_RaptoR
CGN Ultra frequent flyer
- Location
- Edmonton, Alberta
the thing with the USC is the short handguard. if the handguard was a little longer, it would go a long way to looking good with a longer barrel.
I designed an MP5-SD style handguard for the USC45 which sticks out about 2 inches past the end of the handguard, I just haven't had the time to have it made by Shapeways... It would probably look pretty good with a longer barrel, especially if you had a fake can to cover up the barrel.
- Location
- Southern ON.
Has anyone tried to adapt the BAD lever to the USC?
incorrigible
CGN frequent flyer
- Location
- stubble jumper
Has anyone tried to adapt the BAD lever to the USC?
I haven't come across it, however there's not reason why it wouldn't work that comes to mind aside from the distance from trigger to disengaging tab is a bit farther which might enter in some different component geometry. Aside from that the overall concept is sound as a pound.
Last edited:
