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Posted: 9/25/2006 12:35:55 PM EDT
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I've been doing a lot of research, both here and other places on the 'net, but I can't seem to completely make sense of barrel weights and diameters. I'm trying to figure out what constitutes a "heavy" as opposed to "light" barrel for a build I'm working on. For example, Del-Ton is offering kits with 20" "heavy" barrels, but when asked to specifiy, they say the diameter at the gas block is .750, which, from what I understand, is your basic service rifle. So, what is the real story here...what makes a "heavy" or "light" barrel and how does the specified .750 fit in the range of weights? Thanks. |
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unless it is a lightweight w/ a .625 diameter under the FSB (such as CMMG) then most are the .750 under the FSB...this is not what constitutes it as heavy what's under the handguards is what constitutes it as heavy AR15barrels.com profile description ^^^go there^^^ to learn more about it and it should put things into perspective for you  ETA: waiting for Randall to give a more in-depth explanation as i am not an expert on this stuff and don't claim to be but just trying to point ya in the right direction |
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Bull barrels are 1" to 1.050" under the handguards. They will have a 15/16" (0.937") gas block seat. They are generally 0.920" to the muzzle. Heavy barrels are typically AROUND 7/8" (0.875") under the handguards. Some are 0.845" (SPR's) and some are 0.895" (bushmasters), but all are around 7/8" Standard or "Govt" weight barrels are tapered under the handguards. Up near the chamber, they are 0.670" and they are 0.600" behind the FSB step-up. Standard barrels will have a 3/4" gas block seat and then will be just under 3/4" to the muzzle. A2's and M4's fit this description except that M4's also have the M203 cut out front. True lightweight or featherweight barrels more closely emulate the A1 profile. A1 profile is 0.670" tapering to 0.600" under the handguards as well. The difference is that they also have 5/8" gas block seats. A1 barrels are 0.570" out front with a very short step-up to 0.615" at the muzzle just behind the threads. |
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