02-19-2023, 02:37 AM
I had a BCG that wouldn't close on a PTG go-gauge but would close on a Manson go-gauge. Using a different bolt, the BCG would close on both go-gauges. I took all-sorts of measurements of both gauges, both bolts & the bolt carrier. I really didn't see much difference between any of those items. The biggest difference I found was in the bolt-face depth. The bolt that wouldn't close on the PTG go-gauge has a depth of .135" while the bolt that did close has a depth of .1355" That .0005" was all the difference that was needed for the bolt not functioning as required. The headspace difference between the two go-gauges is under .0001". The PTG gauge is perceptibly longer than the Manson, but just barely.
I have no problem using either bolt in my AR. The bolt with the shallower face-depth chambers & ejects factory ammo without any problems. My rifle functions like a Swiss watch. Cases fired from that rifle have nearly identical case-base to datum line measurements regardless of bolt used.
I have no problem using either bolt in my AR. The bolt with the shallower face-depth chambers & ejects factory ammo without any problems. My rifle functions like a Swiss watch. Cases fired from that rifle have nearly identical case-base to datum line measurements regardless of bolt used.
I refuse to be victimized by notions of virtuous behavior.