So what profile would this barrel be categorized as? Thanks for all the insight. I'm a backpacker, so carried weight is ALWAYS a consideration in my mind (dammit).
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It is considered a lightweight profile barrel, the area under the handguards is not .gov profile like with the standard mid-length barrel. If you are out to get a lighter barrel, you may want to look at the Daniel Defense hammer forged lightweight barrels that use a .625" diameter gas block section. G&R Tactical has them in stock and it looks as though BC will carry them soon.