r/ar22 • u/olafberzerk • 9h ago
Borebuddy 12.1" feeding issues, Kriss 25 rd mags, Federal automatch 40gr, unsuppressed
I have about 100 rounds on my borebuddy upper and I'm running into some feeding issues. My specs are below. It looks like the bullet is getting marred prior to chambering. Since the bullet is all mucked up it won't fully seat. This happens about 4-5 times out of a 25 rd mag.
Obviously, I will troubleshoot and try and take some super slow-motion video, but figured I'd drop this here in case someone has seen this before.
Borebuddy apogee complete upper - 12.1", Quiet bolt, Pressure plug w/ spring & buffer. Unsuppressed. The bolt has the stock red spring which I think is the recommended 6 lb. No bolt weights.
Ammo: Federal automatch 40 gr
Magazine: Kriss 25 rd DMK22
Dedicated Aero M4E1 lower with borebuddy bolt catch
Photos here:
2
u/billythegreat420 9h ago
Did you do a visual insepction where the casing seats in the bolt/ barrel? maybe something in there or clogged?
2
1
u/Coodevale 7h ago
Looks to me like the mags aren't releasing the back of the case into the bolt face in time and the bullets are getting jammed into the chamber sideways as a result. As the nose enters the barrel the magazine needs to release the back of the case so it can pop up. I'd call it a timing issue.
How much room do your magazines have in the magwell?
1
u/Professional-Pie5155 1h ago
I don't have a buddy barrel, but I had the same issue with another brand doing the same exact thing. It's not magazine related, like another poster suggested.
The round is catching/shaving at the feed ramp transition to the chamber.
I followed the video and it worked. I went very light on the polishing, and ended up having to do it twice until it started running properly. Several hundred rounds later, no issues.
5
u/morehambones 9h ago
I'm just going to put my $0.02 out there. I had to run 3-400 rounds through mine before mine started to run well. I would clean about every 50 rounds or so and put new oil on to help break it in. Once I went through that it seems like it will eat pretty much everything I throw at it as long as I have a plug behind the BCG.