Are you saying to dissassemble the bolt, and reassemble everything except the ejector and ejector springs (part 65 and 66)? Are those the "plunger"?
There is normally an o-ring under the rear end of the ejector along with the spring. Believe that's the one he's referring to.
Smoke Composites. No qd mount for removal.
That's the ones.
Oh yeah, learned that one lol I have 2 bolt BCA uppers (6arc and 6.5g) and neither would chamber a round without significant force, I pulled the orings and plung but left the spring, they work perfect now.
You pulled the ejector plunger? Or is there some type of extractor plunger as well? I've torn down a few ar bolts but haven't encountered a plunger for extractor.
Are yall doing this on the solo 300 as well? For some reason, I thought you did not need to do this on the solo 300 based on thier design.
Correct both of my BCA bolt uppers came with an oring around the spring and a dense rubber or delrin insert/plunger/guide inside the spring, I have seen extractors with and without the insert over the years, not just BCA. Some kits come with them and some without. in the Grendel (and Grendel case) world it's fairly common to remove the oring and insert to assist with loading and extracting. With a manual operated AR is almost mandatory to remove them, will make life way easier.
The plunger is the rubber piece in the center of the ejector spring in your picture, with the o-ring being the rubber piece surrounding the ejector spring. It's best to remove both in a manual AR.
Both rubber pieces are show in @khuber84 s picture. O-ring outside the ejector spring and plunger inside the ejector spring.
I’ve long thought about doing just that in a .22 or 6mm Creed. It would be badass.
I don't see why the general concept wouldn't work, but the nature of the size and weight of AR10 parts would make the UL-UL part difficult if not infeasible. Seems like the SFAR would be a good place to start, but I've never looked into the idea super closely. The times I have looked at it, I just couldn't beat bolt rifle weights by much, if any.
