08-08-2021, 05:00 AM
Shanner,
As you know the carrier must go a fair way further than ejection and reset to clear the rear of the follower, almost to the end of the available travel. As that happens the carrier must be free to ride up to catch. Even if it was a stiff mag making it difficult to strip it should still lock back on last round.
A couple of questions;
I don't expect the factory ammo is the problem. It also eliminates shonky handloads, but if you have another brand that would be good to test also.
If you pull the charge handle all the way on an empty mag does it catch on the follower and lock back (every time)? If so it is most likely undergassed.
As you know the carrier must go a fair way further than ejection and reset to clear the rear of the follower, almost to the end of the available travel. As that happens the carrier must be free to ride up to catch. Even if it was a stiff mag making it difficult to strip it should still lock back on last round.
A couple of questions;
- Do you have more than one mag? If so, is this happening to all mags?
- Where on the clockface do the cases eject (12-o'clock being the muzzle)? 4 o'clock is about right?
- Is the gas block adjustable? Who put it together?
I don't expect the factory ammo is the problem. It also eliminates shonky handloads, but if you have another brand that would be good to test also.
If you pull the charge handle all the way on an empty mag does it catch on the follower and lock back (every time)? If so it is most likely undergassed.