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1/25/2018 7:38:29 AM
Posted: 11/19/2003 8:05:39 PM EST
I have a few questions about a rifle I am about to take in trade. The rifle has a RRA lower with a Bushmaster A2 upper, 20-inch A2 profile chrome lined barrel 1/7 twist with a KKF fake muzzle brake.
1. I'd like to change out the A2 upper for a Bushmaster flat top with a Bushmaster carry handle- will there be any problems with sight alignment?
2. I usually shoot 55 grain ammo with a 1/9 barrel, will I have any problems with the different barrel twist rate?
Thanks in advance for any help ya’ll can provide.
Link Posted: 11/20/2003 2:38:24 PM EST
1) There should be no issues with sight alignment 2) I've read about 1 in 7 twist barrels spinning the bullet to fast causing it to key hole, but I've never tried it myself.
Link Posted: 11/20/2003 3:56:11 PM EST
It will work fine. Good shootin, Jack
Link Posted: 11/20/2003 4:45:53 PM EST
Thanks for the info guys, just what I was looking for- keep it coming!
Link Posted: 11/21/2003 2:27:43 AM EST
There is no evidence that spinning M193 Ball (55gr) in a 1/7 twist barrel does anything harmful to the bullet or its accuracy. If you're going to shoot iron sights stick with what you have. Only reason to fit a flat top receiver is to put a telescope on it. KISS. -- Chuck
Link Posted: 11/21/2003 6:15:27 AM EST
Sounds like a very cool rig, one that many members here would like to build. [8D]
Link Posted: 11/21/2003 11:02:29 PM EST
Thanks again guys. I just worked a deal for a used Knights M5 RAS, so it should be pretty sweet once it is all done.
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