03-25-2022, 12:44 AM
45
In answer to your original question - In your case seeing the lower is fine, short stroking would occur because there's not enough gas pressure. This can be for a few reasons: the ammunition is not hot enough, not enough barrel length in front of the port (dwell time), the barrel's port is not wide enough, the port and block are misaligned, the gas block is not letting enough gas through, or there is a leak back at the carrier, maybe the key is loose.
I suppose if you unscrewed the AGB enough gas might leak around the threads, but it would have to be pretty loose. It's unlikely to be this.
If you know which screw does what on that block then my next check would be port misalignment. For that you need a bore scope, or take it off and do some careful measuring and marking (or the 'spaghetti method' on the other thread).
In answer to your original question - In your case seeing the lower is fine, short stroking would occur because there's not enough gas pressure. This can be for a few reasons: the ammunition is not hot enough, not enough barrel length in front of the port (dwell time), the barrel's port is not wide enough, the port and block are misaligned, the gas block is not letting enough gas through, or there is a leak back at the carrier, maybe the key is loose.
I suppose if you unscrewed the AGB enough gas might leak around the threads, but it would have to be pretty loose. It's unlikely to be this.
If you know which screw does what on that block then my next check would be port misalignment. For that you need a bore scope, or take it off and do some careful measuring and marking (or the 'spaghetti method' on the other thread).