Just some back ground, I have a BCM upper that i built from the ground up.
Specs:
BCM 16" middy bbl (non bhf)
BCM BCG (auto)
Gunfighter CH
BCM upper receiver
Troy Alpha 13" rail
Spikes ST-T2 buffer and the spring that came with it.
Those are the parts that matter. So all of this is about two and a half years old besides the Alpha, that is newer.
Recently, because I was researching how long buffer springs last, I bought a white buffer spring from Springco. If I had to guess, the rifle has anywhere from 6-8k rounds through it. Never an issue.
When I put the new spring in, on bolt lock on the last round, the CH was coming back. So I did some testing, it seemed only to do it with M193 and not .223 (all 55 gr).
So I decided to use the old spring and it seemed to have stopped. Until recently its doing it on all ammo and even comes back when firing sometimes. I checked the CH and the latch does look a bit worn. I am not sure if it is the reason or not but I bought a new gunfighter to see if it stops.
Is there any other things I can check? It seemed to be the spring at first as that was the only difference, now it happens more often. If I need to change buffers from the one I have to an H1 that is fine. The ST-T2 always worked before so I had no reason to think it was the buffer.


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