Damn. I hate diagnosing these things online. You said the bolt locks back operating manually. That means there should be no issue with lengths. It's a function issue. Replace spring and buffer since they are both bad. Now, shoot the thing. If it does it again it can be either over or under gassed. Under gassed (leaking) will cause the bolt to short stroke. Have you checked your gas rings?
Sent from my iPhone on tapatalk


Reply With Quote

Bookmarks