My PSA bolt came with an O-ring and a black insert(inside of spring, not sure what it's called). Running it in a PSA 14.7" middy and it has been flawless for right over 1200 rounds of mostly Tula steel cased ammo.
My PSA bolt came with an O-ring and a black insert(inside of spring, not sure what it's called). Running it in a PSA 14.7" middy and it has been flawless for right over 1200 rounds of mostly Tula steel cased ammo.
I've read the thread TWICE! I'm a bit confused. Some are saying no o-ring and others are saying use the o-ring. I'm running a M&P 15 OR, carbine length gas system and shoot mostly XM193 5.56 ammo. Soon after I got it, I put an H2 buffer and the Springco extractor upgrade kit. I did not have any problems with the AR before the install, I did it more so as a "just in case". I have had NO problems since the install and have about 1200 rounds thru it. Should I consider taking the o-ring out??
In case anyone can "read" a case here are a few pics of some I shot the other weekend.
http://i199.photobucket.com/albums/a...s/IMG_0708.jpg
http://i199.photobucket.com/albums/a...s/IMG_0706.jpg
http://i199.photobucket.com/albums/a...s/IMG_0702.jpg
http://i199.photobucket.com/albums/a...s/IMG_0701.jpg
I use an o-ring on anything with a CAR gas length system, and on midlength guns which are shot exclusively suppressed.
You may want to explore a blue springco buffer spring as well. I use the springco extractor spring as well, but I run a mid length so I don't use an o-ring.
I see a little bit of ejector smearing, but nothing horrible. The springco blue would help a little in delaying unlocking and slowing the unlocking cycle. But there is nothing horribly wrong going on that I can see.
The main issue is your primer is not flattened, indicating that there are no serious over pressure issues and that your chamber is apparently properly sized (a good thing).
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The Colts we got in work came with a gold colored extractor spring.