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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: 3748201" data-attributes="member: 7157"><p>Well, I just tried the upper on another, known good lower, and had the same problem of the bolt not going fully into battery with a magazine inserted. Then I managed to remove the JP silent capture buffer, and I tried two different springs, a standard and a heavy duty, and two buffers, standard and heavy. Releasing the bolt on an inserted magazine partly stripped a round but stopped; the furthest forward the bolt ever got was with the JP buffer. The problem appears to be in the upper, and somehow seems related to the presence of a magazine, loaded or not.</p><p></p><p>I did notice that if I loaded a fresh round, then dropped the mag after the failure to go into battery, and I ejected the one round, I noticed faint striations spiraling very slightly along the length of the bullet from the case mount toward the point. Like the dashed line on a divided road. The marks weren’t there before the attempted chambering.</p></blockquote><p></p>
[QUOTE="Perplexed, post: 3748201, member: 7157"] Well, I just tried the upper on another, known good lower, and had the same problem of the bolt not going fully into battery with a magazine inserted. Then I managed to remove the JP silent capture buffer, and I tried two different springs, a standard and a heavy duty, and two buffers, standard and heavy. Releasing the bolt on an inserted magazine partly stripped a round but stopped; the furthest forward the bolt ever got was with the JP buffer. The problem appears to be in the upper, and somehow seems related to the presence of a magazine, loaded or not. I did notice that if I loaded a fresh round, then dropped the mag after the failure to go into battery, and I ejected the one round, I noticed faint striations spiraling very slightly along the length of the bullet from the case mount toward the point. Like the dashed line on a divided road. The marks weren’t there before the attempted chambering. [/QUOTE]
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AR-15 failing to go into battery
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