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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
AR technique? - accuracy from the bench
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<blockquote data-quote="cohunt" data-source="post: 1488511" data-attributes="member: 94491"><p>Technically gas pressure isn't actually the issue it's related to boyles law of how much pressure and how much volume of that pressure over what amount of time. It's related to the energy required to move the bolt carrier group.</p><p></p><p>Your barrel (no matter what overall length or gas length it is) has a hole drilled in it...on longer gas systems the hole has to be larger due to lower pressure at the port ( less pressure means more volume is needed) - pretty much this is fixed by the manufacture ( though you can drill it larger if more gas is needed) --- most manufacturers drill them larger than needed so it will function even with "light" loads. </p><p></p><p>In order to reduce too much pressure/volume you need an adjustable gas block so you can "cover" part of an oversize gas port.</p><p></p><p>If its ejecting over you shoulder it's probably fine as that's where it should be. Are you running a carbine buffer system or rifle buffer system? </p><p></p><p>If you want to do a cheap test to see if the gas is affecting your accuracy then if the gas block is not pinned (either set screw or clamp style) then slide the gas block forward about the thickness of a nickel and then shoot ( it wont be semi auto as it will block the gas going back to the carrier) ...if it's more accurate this way then it's most likely over gassed and you need an adjustable gas block. </p><p></p><p>Did you check for copper fouling in the barrel? Did you take off the muzzle device and check the muzzle crown for nicks or damage?</p></blockquote><p></p>
[QUOTE="cohunt, post: 1488511, member: 94491"] Technically gas pressure isn't actually the issue it's related to boyles law of how much pressure and how much volume of that pressure over what amount of time. It's related to the energy required to move the bolt carrier group. Your barrel (no matter what overall length or gas length it is) has a hole drilled in it...on longer gas systems the hole has to be larger due to lower pressure at the port ( less pressure means more volume is needed) - pretty much this is fixed by the manufacture ( though you can drill it larger if more gas is needed) --- most manufacturers drill them larger than needed so it will function even with "light" loads. In order to reduce too much pressure/volume you need an adjustable gas block so you can "cover" part of an oversize gas port. If its ejecting over you shoulder it's probably fine as that's where it should be. Are you running a carbine buffer system or rifle buffer system? If you want to do a cheap test to see if the gas is affecting your accuracy then if the gas block is not pinned (either set screw or clamp style) then slide the gas block forward about the thickness of a nickel and then shoot ( it wont be semi auto as it will block the gas going back to the carrier) ...if it's more accurate this way then it's most likely over gassed and you need an adjustable gas block. Did you check for copper fouling in the barrel? Did you take off the muzzle device and check the muzzle crown for nicks or damage? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
AR technique? - accuracy from the bench
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