Today I finally took out my 10.3" build and I experienced some problems while shooting it. The build is as follows.
10.3 DD barrel with .078" gas port
BCM mod 0 gunfighter comp
Micro MOA Govnah gas block with .070"/.078" ports
BCM KMR 9
BCM BCG
BCM upper
H3 buffer
USGI buffer spring
I had no issues what so ever using the .078" port, but I had a few problems when I switched to the .070" port.
with federal xm193 I had one bolt over base malfunction and one true double feed, trying to feed two live rounds.
with pmc 223 and tula 223 I had at least 5 short strokes and failure to lock back on the last round.
I was a bit shocked I had these problems especially with the xm193 and all the while I thought I had an H2 buffer in there as opposed to the H3. Do you think that extra weight would be enough to cause the problems I had with the xm193? When I arrived home I took off the KMR to verify that the ports were in correct order and they were, I even double checked the port size. Now that I think about it, it might be possible that the bolt over base malfunction was with the large gas port but I am not 100% sure, maybe, but I doubt it. This was also with at least 7 different mags


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