POSP mount for VZ58 project...

Claven2

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Well, I'm in the throws of designing, or rather re-designing and SVD-type mount for the VZ58. This will be a bolt-on (or maybe weld-on?) permanent mod for a VZ58-type rifle to allow mounting of any POSP up to 6X. Larger objectives won't work as they would be too low the the handguard.

This is a multi-phase project as once I get the mount perfected, I have to design a bolt-on flash deflector, probably utilizing the rear sight mount.

Anyhow, forst step is to modify a standard POSP SVD mounting plate. This started out as the standard version sold by East Wave. About 1/8" had been milled off the top to fit the milled lightening cut height on the VZ sidewall and clear the lower pins.

Also, I positioned it laterally to get the right eye relief on either a 4X or 6X POST using an NEA stock adaptor and AR stock, which is a bit longer length of pull than the standard stock. I didn't want to have to remove anything to strip the internals, so recesses are milled into the mount to allow the trigger group pins to be punched out.

Additionally, I had to mill a step precisely into the back of the mount to account for the stepped height of the receiver side wall.

This is how far I got today, this week I'm going to go see a gunsmith friend of mine and an expert welder to decide if I'll permanently TIG the mount to the receiver, or if there is sufficient receiver wall thickness to a fine thread screw to be used to secure the mount, probably with three or four mounting holes.

This photo gives a good idea of what it will ultimately look like:
DSCN1354.jpg


Next, you can see the back of the mount that better illustrates the pin relief holes and the stepped shape of the back of the mount to allow for the receiver step:

DSCN1357.jpg


Note that none of the holes are co-located with the POSP bearing surfaces. the critical area is about mid-way along the bottom part of the dovetail where the POSP cam locks to the mount.
 
What are you going to do about the obscured serial number that on most guns will be permanently hidden behind the mount?

L
 
I'm not too worried because:

a) If I use screws, the mount is removable.
b) I can always re-stamp the serial number elsewhere on the receiver.
 
Y not get a piece of aluminum and tie it down to the rear butt stock screw hole and drill & thread a hole in the front handguard. Then weld that tab were ever it suites you. Like this;
IMG00253.jpg

IMG00252.jpg
 
I've used the Kasat mount, as a lefty, it's too far over to the left of the gun. The mount I'm working on will leave less than 5 thou from the POSP mount bracket to the receiver sidewall, placing it much closer to top dead centre.
 
I've used the Kasat mount, as a lefty, it's too far over to the left of the gun. The mount I'm working on will leave less than 5 thou from the POSP mount bracket to the receiver sidewall, placing it much closer to top dead centre.
Will you have to use a shell deflector to avoid damage or will the offset be sufficient?
PP.
 
No, I will need a shell deflector. I'm going to design and build one out of steel sheet and have it parkerized after it's function etsted. I'll post the details as I progress.
 
Well, I'm in the throws of designing, or rather re-designing and SVD-type mount for the VZ58. This will be a bolt-on (or maybe weld-on?) permanent mod for a VZ58-type rifle to allow mounting of any POSP up to 6X. Larger objectives won't work as they would be too low the the handguard.

This is a multi-phase project as once I get the mount perfected, I have to design a bolt-on flash deflector, probably utilizing the rear sight mount.

Anyhow, forst step is to modify a standard POSP SVD mounting plate. This started out as the standard version sold by East Wave. About 1/8" had been milled off the top to fit the milled lightening cut height on the VZ sidewall and clear the lower pins.

Also, I positioned it laterally to get the right eye relief on either a 4X or 6X POST using an NEA stock adaptor and AR stock, which is a bit longer length of pull than the standard stock. I didn't want to have to remove anything to strip the internals, so recesses are milled into the mount to allow the trigger group pins to be punched out.

Additionally, I had to mill a step precisely into the back of the mount to account for the stepped height of the receiver side wall.

This is how far I got today, this week I'm going to go see a gunsmith friend of mine and an expert welder to decide if I'll permanently TIG the mount to the receiver, or if there is sufficient receiver wall thickness to a fine thread screw to be used to secure the mount, probably with three or four mounting holes.

This photo gives a good idea of what it will ultimately look like:
DSCN1354.jpg


Next, you can see the back of the mount that better illustrates the pin relief holes and the stepped shape of the back of the mount to allow for the receiver step:

DSCN1357.jpg


Note that none of the holes are co-located with the POSP bearing surfaces. the critical area is about mid-way along the bottom part of the dovetail where the POSP cam locks to the mount.

It should work great. If you could align the rail farther down to the bottom of the receiver it would bring a scope lower. I have mounted some rail to CZ on 8-32 hex socket head screws. It was for member here Kable. He wanted it more forward than yours...
railistalled.jpg

czscope1.jpg
 
No, I will need a shell deflector. I'm going to design and build one out of steel sheet and have it parkerized after it's function etsted. I'll post the details as I progress.

Interested :D we also have designed an "universal" deflector for POSP scopes with 24 mm lenses. Need to build and test. Hopefully in a week or so...
 
I can;t make the mount go any lower of the cover for the illuminated reticle contact on a 6X POSP hits the top cover. A 4X could go lower, but not a 6X. Also I have only 4mm clearance to the rear sight block!

In terms of fore/aft positioning, I positioned the scope based on eye relief specific to a 4X or 6X POSP using an NEA adaptor and AR15 collapsible buttstock. It might not be perfect for everyone depending on desired length of pull.

I did visit my gunsmith and the pro welding shop today. I've decided to go with a permanent weld-on method of mounting. I will be using high-current TIG with 3 plug welds along the middle channel of the mount and two edge welds on the front and back of the mount to retain it. It will be very permanent after that.

If the mount was machined a little thicker, screws would be more practical, but since I'm a lefty I machined this one for only 5 thou clearance between the scope bracket and the receiver sidewall. It's only about a centimeter out from TDC on the line of the bore.

here's a "before" shot of the gun:
DSCN1353.jpg
 
I have mounted a 4x24bm posp scope on an ak mounting rail. I follow the instructions given by interammo. Although the receiver is thin at the rear, the 10-32 screw hold it rock solid. I'm happy with that setup. Your look very good:)
IMG_0748.jpg
[/IMG]

The ak mounting rail
IMG_0750.jpg
[/IMG]
 
I can;t make the mount go any lower of the cover for the illuminated reticle contact on a 6X POSP hits the top cover. A 4X could go lower, but not a 6X. Also I have only 4mm clearance to the rear sight block!
Is your 6X scope is actually 6x42? because 4x24 and 6x24 are of the same size...
In terms of fore/aft positioning, I positioned the scope based on eye relief specific to a 4X or 6X POSP using an NEA adaptor and AR15 collapsible buttstock. It might not be perfect for everyone depending on desired length of pull.
100% agree; everybody has his/her own comfortable position...
I did visit my gunsmith and the pro welding shop today. I've decided to go with a permanent weld-on method of mounting. I will be using high-current TIG with 3 plug welds along the middle channel of the mount and two edge welds on the front and back of the mount to retain it. It will be very permanent after that.

just make sure it's properly aligned with a barrel otherwise you may find out that there is not enough vertical adjustments for sighting the scope...
 
I have mounted a 4x24bm posp scope on an ak mounting rail. I follow the instructions given by interammo. Although the receiver is thin at the rear, the 10-32 screw hold it rock solid. I'm happy with that setup. Your look very good:)
svt1940, nicely done!
 
ok, well some progress has been made :) Got to the TIG welder recently...

So far it seems to be turning out well, though I still need to work out a shell deflector - I have a plan for that though ;)

Fresh from the welder:
DSCN1440.jpg

Look at those nice full-penetration TIG welds:
DSCN1441.jpg

This is how I made sure the serial number is still visible on the rifle (yes, part is photoshopped out):
DSCN1442.jpg

Tial fit:
DSCN1443.jpg

This really shows the minimized offset:
DSCN1444.jpg

Look at that tight 5 thou clearance between to mount arms and the receiver sidewall!
DSCN1445.jpg

Bottom of mount flush with top of trigger guard, fo you lefties out there...
DSCN1446.jpg

And after a little cleanup with file and paper:
DSCN1447.jpg
 
Poor receiver ...

Hardly. The receiver welding was done by the welder at Gunco in Ottawa. He's a professional welder with 15 years experience welding rifle receivers.

This hob is properly done - trust me.

It's no different than guys unitizing M14 cylinders by welding, or welding a different bolt handle onto a tactical rifle.

The rifle is a VZ858-2 - nothing collectible or noteworthy about it in any way.

I also removed the paint under the mount before welding. When I get hte shell deflector design sorted out, the gun will get bead blasted all over and be either parkerized or nitro-carburized. The welding will look factory when finished.
 
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