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The Range
Firearms Chat
AR-15 Barrel Question
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<blockquote data-quote="ConstitutionCowboy" data-source="post: 3163651" data-attributes="member: 745"><p>According to the theory I have read about, the heaver barrels are less affected by harmonics. Make sure there is no play between your upper and lower receivers or at least have it dampened. Make sure your barrel fits snugly in the upper receiver (No up-and-down or side-to-side play) before you torque the barrel retaining nut. If the space between the barrel and upper receiver can be shimmed, shim it; otherwise, use green Loctite. (Don't use red or you'll have to use a lot of heat to remove the barrel, and blue does not have the 'body' you'll need to fill the gap.)</p><p></p><p>A lot will depend on what chamber your Bushmaster has, and the twist rate. When your cartridge is chambered, the bigger the space between the ogive of the bullet and the beginning of the rifling the more the bullet will be allow to 'wobble' before engaging the rifling which will then induce erratic flight to the bullet. The heavier - and therefore the longer - a bullet is, the faster the twist rate needs to be. A little research on some of the AR websites will point you in the right direction.</p><p></p><p>Woody</p></blockquote><p></p>
[QUOTE="ConstitutionCowboy, post: 3163651, member: 745"] According to the theory I have read about, the heaver barrels are less affected by harmonics. Make sure there is no play between your upper and lower receivers or at least have it dampened. Make sure your barrel fits snugly in the upper receiver (No up-and-down or side-to-side play) before you torque the barrel retaining nut. If the space between the barrel and upper receiver can be shimmed, shim it; otherwise, use green Loctite. (Don't use red or you'll have to use a lot of heat to remove the barrel, and blue does not have the 'body' you'll need to fill the gap.) A lot will depend on what chamber your Bushmaster has, and the twist rate. When your cartridge is chambered, the bigger the space between the ogive of the bullet and the beginning of the rifling the more the bullet will be allow to 'wobble' before engaging the rifling which will then induce erratic flight to the bullet. The heavier - and therefore the longer - a bullet is, the faster the twist rate needs to be. A little research on some of the AR websites will point you in the right direction. Woody [/QUOTE]
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