Q LLC’s Sugar Weasel Upper is a great replacement for an original Sugar Weasel rifle/pistol, but can also be used in the creation of a custom AR build. These uppers come in three variations: a 7” .300 Blackout barrel with a tapered 1:5 twist and 5/8x24” threads, a 13” 5.56 NATO barrel with a tapered 1:7 twist and 1/2x28” threads, and a 13” .300 Blackout barrel with a tapered 1:6 twist, 5/8x24” threads and Q LLC’s adjustable gas block in a pistol length gas system. All of which come with a M-LOK compatible handguard and a 12 o’clock picatinny rail for end-user customization. Bolt carrier group and charging handle not included. Available Options:7” .300 Blackout barrel with a tapered 1:5 twist and 5/8x24” threads13” .300 Blackout barrel with a tapered 1:6 twist, 5/8x24” threads and Q LLC’s adjustable gas block in a pistol length gas system13” 5.56 NATO barrel with a tapered 1:7 twist and 1/2x28” threads Q, LLC. Sugar Weasel .300 BLK 13" Upper *BCG Not Included* ACC-SW-300-13IN-UPPER