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Old Yesterday, 11:41 AM
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Quote:
Originally Posted by zukiphile View Post
I posed the question because the first reports of PSA 22lr BCGs indicated they may well have been CMMG parts, but apparently were older, outdated stock in which the extractor and FP were secured by spring pins.

I've never changed an extractor on the line, but I've done it with firing pins.
Here are a couple pics of my latest (received this month) PSA .22 upper BCG. The pins are not spring pins, the collar and barrel stub are ~0.700", and the back plate is welded, not peened.



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  #17  
Old Yesterday, 12:03 PM
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Thank you.

Your pictures also show the other frame features of CMMB bolts that don't make it through to all other frames, the forward assist adapter cut, the bottom cut on the backplate, the full auto trip cuts and the drilled hole near the back plate.
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  #18  
Old Yesterday, 02:07 PM
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Quote:
Originally Posted by 9x19 View Post
Here are a couple pics of my latest (received this month) PSA .22 upper BCG. The pins are not spring pins, the collar and barrel stub are ~0.700", and the back plate is welded, not peened.



That looks identical to my RTB bolt purchased about two or three years ago.
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