Author Topic: PWS CQB Comp  (Read 3351 times)

Offline KoKodog

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PWS CQB Comp
« on: April 16, 2011, 07:31:07 PM »
anyone here have one, in the .30 cal ?

if you do, will you measure it to see if there is enough stock so that it could be opened up for use on a AR45 ?

http://primaryweapons.com/store/pc/viewPrd.asp?idproduct=142&idcategory=6
^^^^ thats the page for it

http://www.defensereview.com/pws-diablo-long-stroke-gas-pistonop-rod-driven-556mm-ar-15-sbr-upper/
^^^^^ there are some good pics of it on this page, click on the pics for higher resolution images and the insides are shown in fair detail, the 5.56 model is shown ...... I think there is enough stock there

the PWS webpage says the thread pitch is 5/8-24 RH, I believe that is the threads on the muzzle of a Oly .45 barrel

I'm planning a build and the PWS CQB Comp should be capable of taming down the bark/bite of my hand-rolled 185gr JHP +P's at the muzzle

they have a video posted on youtube of it on their Diablo SBR in 7.62x39, it's performance does look impressive http://www.youtube.com/watch?v=PUgGKptKwvI

Offline gunsmoke

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Re: PWS CQB Comp
« Reply #1 on: April 26, 2011, 07:46:49 PM »
anyone here have one, in the .30 cal ?

if you do, will you measure it to see if there is enough stock so that it could be opened up for use on a AR45 ?

http://primaryweapons.com/store/pc/viewPrd.asp?idproduct=142&idcategory=6
^^^^ thats the page for it

http://www.defensereview.com/pws-diablo-long-stroke-gas-pistonop-rod-driven-556mm-ar-15-sbr-upper/
^^^^^ there are some good pics of it on this page, click on the pics for higher resolution images and the insides are shown in fair detail, the 5.56 model is shown ...... I think there is enough stock there

the PWS webpage says the thread pitch is 5/8-24 RH, I believe that is the threads on the muzzle of a Oly .45 barrel

I'm planning a build and the PWS CQB Comp should be capable of taming down the bark/bite of my hand-rolled 185gr JHP +P's at the muzzle

they have a video posted on youtube of it on their Diablo SBR in 7.62x39, it's performance does look impressive http://www.youtube.com/watch?v=PUgGKptKwvI

Those PWS brakes work really well. I've shot several AR10s and FALs withem.

I was just thinking.......

When I build an AR45 about contacting Clark in Keithville LA and asking them if they'd custom make a threaded version of their .460 Rowland Comp, after all it does help a 1911 designed and built for 19K PSI handle 39K PSI so it obviously works...........

just a thouhjt....

Offline KoKodog

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Re: PWS CQB Comp
« Reply #2 on: April 27, 2011, 09:43:13 PM »
I did get a email reply back from Stacey Nagy at Primary Weapons Systems


To allow for clearance of .45ACP, the baffle end piece would have to be opened up so much that material would have to be removed from the flash tines as well.  Any modification such as this would void the PWS manufacturer's warranty on the CQB.  I hope this helps and thank you for contacting us.



I still think I could take it apart & chuck it up in a lathe and run a boring bar through it (if its not above 45 on the Rockwell scale in hardness) and make it work

Offline gunsmoke

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Re: PWS CQB Comp
« Reply #3 on: April 28, 2011, 05:27:14 PM »
What kind of I. D. do you think you'd need to be safe from the proj pass through?

Offline KoKodog

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Re: PWS CQB Comp
« Reply #4 on: April 30, 2011, 02:06:04 PM »
What kind of I. D. do you think you'd need to be safe from the proj pass through?

well, if you go with the thought process for opening up a standard M14 flash hider to National Match standards, you use a #7 taper reamer and gauge it (with a bore cleaning guide, per instructions -  CLICK HERE ) as you open it up - bit,by,bit ..... now a #7 taper reamer starts at 0.3297" and goes up to 0.4220" as you can see here CLICK HERE but you do not need to open up at the barrel end of the flash hider to the max size

my best guess would be about 0.525" minimum to a (theoretical) max of 0.590" for a 0.451" diameter bullet ~~ now that is just top of my head guess work not sitting down with graph paper drawing to a scale of 10 to 1 for exaggerated view and assuming bullet flight is stable from the lands
« Last Edit: April 30, 2011, 03:07:57 PM by KoKodog »

Offline KoKodog

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Re: PWS CQB Comp
« Reply #5 on: May 15, 2012, 12:53:52 AM »
I just came into possession of a PWS MK107 Diablo upper in 5.56mm w/ the CQB Comp

I finally have a few answers about the PWS CQB Comp
now I am certain there is room to open one up for .45 caliber
the most likely candidate would be the .30 cal version w/  5/8 x 24r thread

a loaded .45 ACP hardball round will set between the tines with a bit of "wiggle room"

the inside cone would need to be "welded up" to make enough stock for the bore to work with the cone
to force the unburned gasses/powder to flow and wrap back around themselves for complete burning


« Last Edit: May 15, 2012, 01:09:46 AM by KoKodog »