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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
I want to build an AR help me get started
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<blockquote data-quote="5.56×250" data-source="post: 1820152" data-attributes="member: 110162"><p>As you probably already know, the barrel extension on an AR has a seating ring that contacts the threaded extension on the upper receiver. Most uppers ive messed with were almost perfectly square (threaded extension face to barrel/bcg bore). If you get one thats off a little, you have a rifle with the barrel pointing in a somewhat different direction than the flat top rail on the upper ! Probably doesnt matter much if your spraying bullets at a siluette while running around doing acrobatics, but if you sight to barrel axis needs to be straight enough to hammer steel at 1000yds, its a pretty important spec to check and fix, if needed.</p><p>If its off a lot, and or you have a tight barrel extension to bolt fit, you might have some bolt binding/reliability issues.</p></blockquote><p></p>
[QUOTE="5.56×250, post: 1820152, member: 110162"] As you probably already know, the barrel extension on an AR has a seating ring that contacts the threaded extension on the upper receiver. Most uppers ive messed with were almost perfectly square (threaded extension face to barrel/bcg bore). If you get one thats off a little, you have a rifle with the barrel pointing in a somewhat different direction than the flat top rail on the upper ! Probably doesnt matter much if your spraying bullets at a siluette while running around doing acrobatics, but if you sight to barrel axis needs to be straight enough to hammer steel at 1000yds, its a pretty important spec to check and fix, if needed. If its off a lot, and or you have a tight barrel extension to bolt fit, you might have some bolt binding/reliability issues. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
I want to build an AR help me get started
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