![]() ![]() I would highly suggest that you use some rubbing compound and polish the feed ramps. I used a small diameter stone to blend the steel barrel extension to the aluminum upper extended feed ramp. I have done the same modification that you have pictured to my three 7.62X39 uppers, which has greatly improved feeding reliability. Since the center line of the 7.62 round is lower, there would need to be a deeper ramp because the round starts further from the center line of the bore. The 7.62X39, having a larger diameter, will have its center line lower, compared to the center line of the bore. So the top of either round is up against the top lips of the magazine. The 7.62X39 round is larger in diameter than 5.56X45. With an unaltered carrier whatever magazine is installed is limited in height by the bottom of the carrier. Refer to our Compatible Headspace Gauge Chart below or ask your sales representative if your gauge is cross-compatible.Some geometry to think about. We list known compatible chambers with each headspace gauge product. 30-06 Springfield headspace gauges are usable in. FIELD gauges are slightly shorter than the SAAMI maximum in order to give a small safety margin.Ĭross-compatibility: Many of our headspace gauges are compatible with multiple chamber specifications. If chamber headspace is excessive, the gun should be taken out of service until it has been inspected and repaired by a competent gunsmith. If a rifle closes on a FIELD gauge, its chamber is dangerously close to, or longer than, SAAMI’s specified maximum chamber size.
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