This Q LLC Sugar Weasel replacement upper (brand part no. ACCSW30013INUPPER) is chambered in .300 Blackout with a 13-inch threaded barrel, built as a bare upper with no lower receiver included.

Key Specifications

• Chambered in .300 AAC Blackout.
• Barrel length of 13 inches.
• 5/8-24 threaded muzzle.
• Tapered barrel profile.
• 1:6 twist rate.
• Adjustable gas block.
• Pistol-length gas system.
• Bolt carrier group included.
• Designed as a replacement upper for the Sugar Weasel platform.

Frequently Asked Questions

Can I put this on any AR-15 lower? Since this is a bare 13-inch upper under the 16-inch federal rifle minimum with no lower receiver included, federal Short-Barreled Rifle rules only come into play once it’s assembled onto a complete, shouldered rifle. Installing it on an unregistered rifle configuration without a prior approved ATF Form 1 would create an illegal SBR, so confirm your build’s configuration and registration status before assembly.

Is the BCG included? Yes, the bolt carrier group ships with this upper.

What gas system does it use? A pistol-length gas system with an adjustable gas block.

Buy the Q LLC Sugar Weasel Replacement Upper

Order this upper from our Q LLC lineup, browsable in our full AR15 uppers selection, from a Lubbock, TX gun shop.