Typically the barrel. 3 gun rifles often have stainless barrels. Also the handguards. You don't see wml on a 3 gun, so why add weight for attachment methods? Then the gas system and carrier. On an all out 3gun, aluminum or titanium carriers are shuffled by gas flowed through an adjustable gas block in the barest necessary amount. Then muzzle device. The most effective comps and brakes are the only competitive choice.
differences between 3 gun and mil spec ar15s??
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