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Posted: 2/25/2007 2:07:35 PM EST
[Last Edit: 2/25/2007 3:30:31 PM EST by rain252]
I have a 16" Bushmaster M4 type flat-top I bought a couple months ago.
I am thinking about doing the ATF form 1 to allow making an NFA weapon, and buying a short barreled upper to put on my lower. (Rather than buying a whole new short-barrel carbine). Bushmaster sells a upper with 11.5" barrel for $565. Is there any other vendors I should consider getting it from? I want a quality upper for this, and I guess I have a warm and fuzzy feeling buying it from BM since it will be going on a BM lower. I have seen a Lewis Machine Tool 10.5" upper, but its more expensive and has a 1:7 twist (I think). I like the 1:9 of the BM. I saw one from Model 1 sales......any good? Also, I will likely put a LaRue or Daniel defense free-float rail fore end on this shorty.
Any recommendations?
Link Posted: 2/25/2007 5:23:18 PM EST
Link Posted: 2/25/2007 5:29:29 PM EST
Link Posted: 2/25/2007 5:45:26 PM EST
While I am not in the market for an SBR at this moment, my general thoughts are that as barrel length diminishes, caliber should increase. Therefore if choosen to go SBR I would think that a 9mm subgun is the way to go.
Link Posted: 2/25/2007 6:00:41 PM EST
I'll be shooting 55gr and 62 gr bullets. 1:7 is the way to go?
With the short barrel, it changes things enough that you need a shorter twist to sabilize?
Link Posted: 2/25/2007 6:42:35 PM EST
Link Posted: 2/25/2007 7:28:07 PM EST
[Last Edit: 2/25/2007 7:35:34 PM EST by rain252]
Actually, I was thinking 1:9 because I have read that it is optimal for stabilizing the 55 and 62 gr bullets. Since those are the bullets I will be shooting, thats why i was thinking along those lines. But it does seem that most every short barrel offered by vendors is a 1:7. ok.....1:7 it is.
Link Posted: 2/25/2007 9:18:39 PM EST
Link Posted: 2/26/2007 5:46:12 AM EST
then what I want to make sure of......will a 1:7 twist work well with 55gr bullets out of a 10-11" barrel as far as stabilizating the bullet when shooting no longer than, say, 100 yds.? (I mean when just considering stabilization and not fragmenting for self defense). Would a 1:9 stabilize a 55gr bullet well, even though the barrel is so short?
Sorry if I am being redundant here, but I am a little confused about this.

Link Posted: 2/26/2007 12:39:34 PM EST
Link Posted: 2/26/2007 1:05:21 PM EST
I recently went through some of these same issues on a build.

Do you like the fit between your current lower / upper receivers? If the answer is yes, then simply buy a barrel from a reputable dealer (like the one commenting in this thread) and build it yourself. Your going to be installing a full float handguard anyway.
Link Posted: 2/26/2007 3:23:22 PM EST
Yes, the BM I have is fine for fit..... nice and tight. Thanks for the idea. Since I got this rifle, I kind of wished I had gone with a mid-length 16". I have the patrolmans carbine with the short handguards.
Maybe I should just talk to Randall about cutting it down. (after getting a Form 1 completed, of course). I'll send you a note about it, Randall.
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