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The Range
Rifle & Shotgun Discussion
AR-15 failing to go into battery
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<blockquote data-quote="Perplexed" data-source="post: 3753404" data-attributes="member: 7157"><p>I should summarize what I’ve done, so it’ll make more sense. Here goes:</p><p></p><p>1) Tried two different full auto bolts, one of which came from a known good AR</p><p>2) Tried two different lowers, one of which came from a known good AR</p><p>3) Tried two different barrels, both brand new: KAK and Aero Precision</p><p>4) Tried three different springs: JP silent capture, standard carbine, extra power</p><p>5) Tried two different buffers: carbine and H1</p><p>6) Tried two different magazines: aluminum USGI and Magpul, both new</p><p></p><p>In all cases, the bolt would strip a round from the mag, but not chamber it fully. If I removed the mag and recharged the bolt, the round would chamber and the bolt would go into battery. A fully loaded mag also was difficult to seat on a closed bolt using both lowers.</p><p></p><p>I did notice that after a dozen tries, there already was wear on the top of the bolt stop and on the bottom of the bolt in a new lower. But the OOB problem persisted with the known good lower.</p><p></p><p>That’s why I suspect an issue with the New Frontier Armory upper. Possibly out of spec, and the bolt is riding a bit too low in the races of this upper, since the OOB issue occurred with two different bolts in the same upper?</p></blockquote><p></p>
[QUOTE="Perplexed, post: 3753404, member: 7157"] I should summarize what I’ve done, so it’ll make more sense. Here goes: 1) Tried two different full auto bolts, one of which came from a known good AR 2) Tried two different lowers, one of which came from a known good AR 3) Tried two different barrels, both brand new: KAK and Aero Precision 4) Tried three different springs: JP silent capture, standard carbine, extra power 5) Tried two different buffers: carbine and H1 6) Tried two different magazines: aluminum USGI and Magpul, both new In all cases, the bolt would strip a round from the mag, but not chamber it fully. If I removed the mag and recharged the bolt, the round would chamber and the bolt would go into battery. A fully loaded mag also was difficult to seat on a closed bolt using both lowers. I did notice that after a dozen tries, there already was wear on the top of the bolt stop and on the bottom of the bolt in a new lower. But the OOB problem persisted with the known good lower. That’s why I suspect an issue with the New Frontier Armory upper. Possibly out of spec, and the bolt is riding a bit too low in the races of this upper, since the OOB issue occurred with two different bolts in the same upper? [/QUOTE]
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AR-15 failing to go into battery
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