Originally Posted by mig1nc I believe the ATF measures from the closed bolt face. Sent from my Pixel 2 using Tapatalk Yes, that's right the ATF measures from the closed breech face. So then, from the closed breech face what is the length of an M4 barrel without a muzzle device? This could be an important detail for people when doing a pin and weld muzzle device. TED
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