Bushmaster 24" Varminter barrel 5.56 1/9 twist.This is an original Bushmaster barrel, not one of the Remington made ones.(or whoever owns them today) It's got about 50 rounds through it and it shoots awesome but it's just too heavy for my needs and I never shoot it. Makes a great rat slayer though. It will come with low profile gas block, gas tube and tubular Handguard. Listed for $402 on Bushmaster's website and out of stock, I'll sell it for $325 OBO cash.