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Posted: 2/8/2002 12:03:42 PM EDT
I just purchased a Bushmaster AR15 which has a post ban lower and a pre ban Colt HBAR upper with a 20" barrel and a 1 in 7 twist. I have heard a few opinions as to the best ammo to use. It seems like the 50 or 55gr ammo is more favored, but how does it perform with the faster 1 in 7 twist? I would appreciate any comments or opinions before I buy a quantity of ammo.
I've also heard that the 1 in 9 twist is more accurate than the 1 in 7, if this is true, how much more accurate is the 1 in 9 twist? Would it be worth it to re-barrel with a post ban 1 in 9 twist?
Link Posted: 2/8/2002 12:18:18 PM EDT
Very funny.

Link Posted: 2/8/2002 12:20:59 PM EDT
I assume you are a troll...

But if you are just a newbie: it is illegal to have a pre-ban upper on a post-ban lower.

You can sell the upper, or grind off the bayo lug and permanatly attach a muzzle brake to make it legal.

Link Posted: 2/8/2002 12:53:33 PM EDT
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