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Posted: 6/16/2006 3:47:09 PM EDT
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can anyone tell me the differences in the light weight 16" barrels such as these. Colt 16" lightweight Bushmaster 16" superlight weight JT distributing 16" lightweight model 1 sales 16" lightweight etc..etc..so on and so forth.... seems most are 16" profiles seem almost identical, 1-9 twist seems common. I guess what im asking is paying say $350 for a colt really gonna be that much better than say a $185 model 1 sales? |
MAP, do you mean that your BM UPPER does not have feedramps? surely you don't mean that your BM barrel doesn't have any feedramps. |
okay forrest i'm feeling kindof stupid right now. I thought that the term "M4 feedramp" refers to cuts made in the upper receiver, are you saying that the feedramps in the barrel extensions have some sort of M4 specific profile in their cut? |
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BM uses rifle extensions on barrels, and no, the receiver does not have any cuts in it. M4 ramps are a two part design. The extensions have larger ramps than the rifle extensions, and the receivers have cuts that extend the ramps. Bigbore has a good thread on the differences with several pictures that help to clarify... ETA: to stay on topic of the original post... I have a Bushy Superlight and a Shaw superlight. The Bushy has a slightly thinner profile, as measured by calipers, and, subjectively, feels alot lighter than the few thousands of an inch difference would warrant. I also noted that the taper at the chamber end starts at about half the distance on the BM compared to the Shaw. For example, and I know the dimensions are not accurate but I don't feel like taking off handguards and measuring right now, the BM starts to taper say an inch past the chamber where the Shaw starts to taper at like 2 inches. Both are like 16.1" with 1:9 twist. The Shaw is 4140 and chrome lined, the BM 4150 and chome lined. Neither have "F" marked FSB's or M4 barrel extensions. Both are pretty accurate shooters, but they do heat up quickly. The Shaw wanders a little more when hot... Hope this helps. |
Yes, The angle is different and the bottom is opened up to meet the ramps that are in the receiver. Somebody will be along shortly to post a pic I'm sure, otherwise you can search the Archives as there are plenty of threads on this. |
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I've never seen 'eratic behavior', I have seen groups open up but one doesn't buy a LW barrel for precision shooting. Nor are the terms 'high volume of fire' and 'precision shooting' routinely used in the same sentance. I'd be more worried about cookoff. Which takes a minimum of 120 rounds fired at full-auto rates (roughly 750RPM) changing magazines as fast as possible. Keep the rate to 12-15 rounds per minute and you can shoot indefinately and the rifle should still be able to keep a 4moa group with service ammo. |
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