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Posted: 11/17/2009 12:27:06 PM EDT
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I have a Bushmaster M4A3 "Patrolman's Carbine" that I have had for a few years and I love it. I'm planning on doing another build and using mostly Bushmaster parts and I plan on duracoating most of it (lower and upper receiver, barrel, etc.). The only question I had was about the barrel. Should I use a 1/7 twist? IThe guy at Bushmaster told me that the only real advantage to the 1/7 is that you can shoot heavier grain bullets. He said that for anything high 60's grain and lower, I wanted to be using the 1/9. I will probably never shoot higher than that so is he correct? Also, here's a list of my planned build. Any suggestions or criticisms would be appreciated.
Bushmaster Lower Receiver Bushmaster Upper Receiver with M4 feed ramps Bushmaster 1/9 twist 16" M4 type barrel assembly RRA Lower Parts Kit with Bill Springfield 3lb. trigger job Young Manufacturing Chrome Bolt Carrier Bushmaster Titanium firing pin Bushmaster Misc. parts (ejection port cover, charging handle, buffer tube) Daniel Defense 7.0 Lite Rail Magpul Stock, Grip, and Enhanced Trigger Guard Troy BUIS |
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