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Posted: 2/10/2006 7:33:28 AM EDT
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Does anyone know the weight or profile of the 16" CMMG lightweight barrel? I am wondering if it is lighter than the M4 proile because I have heard it is not true lightweight spec... I have tried to call them but they must be on their way to Shot, so it was a no go. Any info would be appreciated. Thanks |
Not trying to be a smart @%%, but I didn't know there was a lightweight spec. I thought it was a civilian market creation. Doc |
Well, pencil profile, A1 profile etc...original Colt A1 spec. The .625 or whatever. |
It's the barrel profile the military used for 20+ years before the A2/M4 barrels were released which thickened the barrels from the FSB forward. Cheebacca, IIRC the CMMG barrels are 0.625 EXCEPT for the area under the FSB which is 0.75". It would make the barrel an ounce or less heavier than a true LW profile. |
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I suppose the .750 barrel became “standard” when the Marine Corps adopted the Government profile barrel. The problem is that there aren’t many .625 gas blocks or front sights out there. It would be easy to have barrels turned down to the proper .625 diameter but the other hardware just isn’t readily available. And that’s a shame because the AR-15 is supposed to be a light rifle. I’ll grant that there are special roles (varmint, target, sustained rapid fire, etc.) where the benefits of a heavy barrel outweigh the drawbacks. But for general use the light barrel is better. Besides, having a 5.56 rifle that weighs as much as a comparable 7.62 rifle has never made a lot of sense to me. But, maybe it’s just me. Anyway, it would be nice if someone came out with a full range of .625 barrels and accessories. Just an idea for some small business looking for a niche in the AR marketplace. |
wilson jt distributing colt |
yankee hill bushmaster larue tactical p.r.i. colt all offer .625 fsb or gas blocks |
Ok, that makes sense. I was thinking like a Busy Superlight. |
However, the .625 FSB has the same or more metal in the barrel area, so the difference is negligible. I have a superlight with .750 FSB and it is great fun. Turned down a standard barrel. |
Right. There isn't much more meat on the .750 FSB superlights. Still, they aren't true superlights because they don't use the .625 FSB. Really it's a matter of whether you really care or not about having a little more under the FSB. I personally think the .750 FSB superlights look kind of hokie. |
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The problem, as I understand it, is that there are no "F" marked .625 FSB's, so if you are using an A2 upper you are GTG, but you may have issues if you use a flat top. No? Besides, how much can that little bit really weigh? Unless you are trying for a A1 rebuild project, it's no big deal. |
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