PDW builds - Lets see them, and share results
- Thread starter AbHobbyist
- Start date
Cute? Ugh lol.
The receiver is all Bushmaster XM15-E2S with the MOE grip and trigger guard and CTR stock with four position receiver extension. The A2 upper is Armalite with a Bushmaster heavy barrel. It's the same rifle I had up earlier in the thread with the new stock and Vortex addition.
With the old stock (ACE skeleton) she shot 9" pie plate 10rd (LAR mag) "groups" as fast as I could pull the trigger on a Fig 11 at 50 yds.
The next time I get out I'll try to "bench" the rifle and shoot some groups at 50, 100 and 150 yds.
winnipegger
CGN frequent flyer
wahh?
- Location
- Vernon, BC
Gentlemen:
There are some very interesting builds and over all I really like what I see.
I have some questions For those that are in the know. I think a little preamble/background may be in oder as we proceed.
I have started to work with the 7.62x39 in the AR platform. My current carbine wears a 16" barrel. To date I have done a goodly amount of research, and I understand that for the most part the bolt & its extractor are the week link in the chain. However I believe there are some work arrounds, based on the inexpensive none-corrosive ammo I have in the bin (both Norinco M43 ball, and some commercial MFS ammo), I could not resist the opportunity to build said carbine when it presented itself.
I have not been working with it long (less that 500 round to date), but success via function, reliability and accuracy at CQB distance (50M and less) have been better than expected. Being able to work with the 10 round XCR mirco mags has been a real plus. and In its current configuration, the carbine seems to have a similar recoil pulse to that of the 6.8 SPC. It seems to be very potent little combo.
However, when one looks at the ballistics an trajectory, the 7.62x39 is really a 300M cartridge at best. With that in mind, I was wondering the suitability of the 7.62x39 in the AR platform both as a CQB (10-11.5" barrel) and PDW carbine (7.5-8.5" barrel).
When going to a shorter barrel does the 7.62x39 suffer as badly balistically like the 7.62 NATO and 6.8 SPC do?? Or are the effects less pronounced like the 300 whisper/blackout/fireball.
I am looking for constructive comments from those with actual first hand experience and knowledge to share.
I thank you in advance for your time and look forward to your comments.
Regards and all the best
AbH
There are some very interesting builds and over all I really like what I see.
I have some questions For those that are in the know. I think a little preamble/background may be in oder as we proceed.
I have started to work with the 7.62x39 in the AR platform. My current carbine wears a 16" barrel. To date I have done a goodly amount of research, and I understand that for the most part the bolt & its extractor are the week link in the chain. However I believe there are some work arrounds, based on the inexpensive none-corrosive ammo I have in the bin (both Norinco M43 ball, and some commercial MFS ammo), I could not resist the opportunity to build said carbine when it presented itself.
I have not been working with it long (less that 500 round to date), but success via function, reliability and accuracy at CQB distance (50M and less) have been better than expected. Being able to work with the 10 round XCR mirco mags has been a real plus. and In its current configuration, the carbine seems to have a similar recoil pulse to that of the 6.8 SPC. It seems to be very potent little combo.
However, when one looks at the ballistics an trajectory, the 7.62x39 is really a 300M cartridge at best. With that in mind, I was wondering the suitability of the 7.62x39 in the AR platform both as a CQB (10-11.5" barrel) and PDW carbine (7.5-8.5" barrel).
When going to a shorter barrel does the 7.62x39 suffer as badly balistically like the 7.62 NATO and 6.8 SPC do?? Or are the effects less pronounced like the 300 whisper/blackout/fireball.
I am looking for constructive comments from those with actual first hand experience and knowledge to share.
I thank you in advance for your time and look forward to your comments.
Regards and all the best
AbH
Clobbersauras
CGN Ultra frequent flyer
- Location
- Waaay out west.
AB - The 7.62x39 is very suited to SBR projects. It's case volume relative to bullet size is fairly small and it loses less velocity compared to other SBR conversions . I chrono'd my 12 inch CZH 2003 vs a 19 inch 858 and the performance was very good.
19inch 7.62x39
AVG Velocity: = 2294fps +/- 21fps
12inch 7.62x39
Average Velocity: 2119fps+/- 29fps
So you lose roughly 175 fps with a 7 inch reduction in barrel length, not too shabby. For me it's a 200 yard rifle though.
I've been really thinking about the PWS Diablo. It would make an excellent SBR but reliable mags are an issue and I still can't find any long term reports regarding parts wear, carrier tilt etc...
[Youtube]PUgGKptKwvI[/Youtube]
19inch 7.62x39
AVG Velocity: = 2294fps +/- 21fps
12inch 7.62x39
Average Velocity: 2119fps+/- 29fps
So you lose roughly 175 fps with a 7 inch reduction in barrel length, not too shabby. For me it's a 200 yard rifle though.
I've been really thinking about the PWS Diablo. It would make an excellent SBR but reliable mags are an issue and I still can't find any long term reports regarding parts wear, carrier tilt etc...
[Youtube]PUgGKptKwvI[/Youtube]
Clobbersauras
CGN Ultra frequent flyer
- Location
- Waaay out west.
^^Questar has been selling the PWS with a 7" barrel for a while now. I'm sure someone on CGN must have one.
That's what I was wondering, thanks for posting! 11.8", here I come!
- Location
- Vernon, BC
Blaxsun:
I think I cover it in my post above, but if not, my apologies
regards
AbH
blaxsun
CGN Ultra frequent flyer
Not at all... I like AR15 pr0n as much as the next guy (I just prefer the shortys).
