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<blockquote data-quote="Perplexed" data-source="post: 3006851" data-attributes="member: 7157">At the range now.&nbsp; This time, I loaded one round to see if the bolt would lock back on a known good, empty USGI metal magazine.&nbsp; After reseating the gas block and using a clipped carbine spring and a 3 oz. carbine buffer, with these brands of ammo:[ATTACH=full]103284[/ATTACH] The bolt would not lock back with either of the first two brands, but would lock back with the American Eagle 5.56 ammo.&nbsp; Tried ten rounds of the AE to see if I would have any cycling problems, and had none.&nbsp; Then I switched to a PMAG 30 rounder, and the bolt would not lock back after a single round of AE.&nbsp; However, the bolt did cycle ten rounds of the AE through the PMAG, and locked open after the last round. So it looks like that right now, the AR is indeed ammo sensitive and even with the AE 5.56, cycling is marginal.&nbsp; Drilling out the gas port is looking more and more like the solution.</blockquote>

[QUOTE="Perplexed, post: 3006851, member: 7157"] At the range now. This time, I loaded one round to see if the bolt would lock back on a known good, empty USGI metal magazine. After reseating the gas block and using a clipped carbine spring and a 3 oz. carbine buffer, with these brands of ammo: [ATTACH=full]103284[/ATTACH] The bolt would not lock back with either of the first two brands, but would lock back with the American Eagle 5.56 ammo. Tried ten rounds of the AE to see if I would have any cycling problems, and had none. Then I switched to a PMAG 30 rounder, and the bolt would not lock back after a single round of AE. However, the bolt did cycle ten rounds of the AE through the PMAG, and locked open after the last round. So it looks like that right now, the AR is indeed ammo sensitive and even with the AE 5.56, cycling is marginal. Drilling out the gas port is looking more and more like the solution. [/QUOTE]

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