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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
PSA 300 BLK upper, any good?
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<blockquote data-quote="QuietTexan" data-source="post: 2423630" data-attributes="member: 116181"><p>I'm not really surprised, you're introducing a variable you didn't have before. The movement of a loose piece inside the rifle aside, you're probably causing something else to become the limiting tolerance and it's way out of whack. Same concept behind you can push a bullet too fast for a barrel harmonic. Something you might not be able to find without a lot of work and disassembly like the extension is out of true, the carrier is rubbing something, the bolt is unlocking at the same point in the cycle but the upper is moving in a different direction at that time now and the movement of the bolt or carrier is pushing you up or down differently. You could probably tune it out, but if taking the part out makes it stop that seems easier to me.</p><p></p><p>I get the logic behind making the upper and lower tighter, I'm just not sure it bears out in reality until all the moving parts in the upper are put into much tighter tolerance than these things are normally made to. Kind of like how no one worries about the action face being cut a few degrees off square in a factory Rem 700 because when the factory barrel has several constrictions in it and it's torqued on to where it's compressing the shoulder to the action there's no way to shoot the difference caused by the face being off. You put a brand new Bartlein on the action and don't run it it with a 1200# impact wrench like I'm assuming they do at the Remington factory, maybe the face being off all the sudden matters. There's probably some AR equivalent of that.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2423630, member: 116181"] I'm not really surprised, you're introducing a variable you didn't have before. The movement of a loose piece inside the rifle aside, you're probably causing something else to become the limiting tolerance and it's way out of whack. Same concept behind you can push a bullet too fast for a barrel harmonic. Something you might not be able to find without a lot of work and disassembly like the extension is out of true, the carrier is rubbing something, the bolt is unlocking at the same point in the cycle but the upper is moving in a different direction at that time now and the movement of the bolt or carrier is pushing you up or down differently. You could probably tune it out, but if taking the part out makes it stop that seems easier to me. I get the logic behind making the upper and lower tighter, I'm just not sure it bears out in reality until all the moving parts in the upper are put into much tighter tolerance than these things are normally made to. Kind of like how no one worries about the action face being cut a few degrees off square in a factory Rem 700 because when the factory barrel has several constrictions in it and it's torqued on to where it's compressing the shoulder to the action there's no way to shoot the difference caused by the face being off. You put a brand new Bartlein on the action and don't run it it with a 1200# impact wrench like I'm assuming they do at the Remington factory, maybe the face being off all the sudden matters. There's probably some AR equivalent of that. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
PSA 300 BLK upper, any good?
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