The Q LLC Sugar Weasel Complete Upper (brand part number ACCSW55613INUPPER) is a compact 5.56 NATO AR-15 upper built around a 13-inch barrel for shooters who want a shorter, more maneuverable build. Q LLC cuts the barrel with a 1-in-7-inch twist rate, a fast enough spin rate to stabilize the heavier bullet weights that shooters often run in a short-barreled 5.56 setup. As a complete upper, it drops onto a compatible AR-15 lower to add a ready-to-run, compact 5.56 capability without sourcing a barrel, handguard, and bolt carrier group separately. This upper is sold without a lower receiver, so the buyer supplies the lower and completes the legal configuration of the finished firearm.

Key Specifications

• Chambered in 5.56x45mm NATO/.223 Remington.
• Barrel length is 13 inches.
• Rifling twist rate is 1-in-7 inches.
• Sold as a complete upper assembly, ready to mate to a compatible AR-15 lower receiver.
• Part of Q LLC’s Sugar Weasel compact upper line.

Frequently Asked Questions

Does this upper come with a lower receiver? No, this is an upper receiver group only; the buyer supplies a compatible AR-15 lower to complete the firearm.

Is a 13-inch barrel legal to buy without paperwork? Yes, this upper by itself is an ordinary Title I part. Federal law only restricts installation: pairing a sub-16-inch upper with a shouldered, rifle-configured lower that is not registered as a Short-Barreled Rifle would create an illegal, unregistered SBR, so it must go on a pistol-configured lower or a properly registered SBR lower.

What twist rate does this barrel use? 1-in-7 inches, fast enough to stabilize heavier 5.56 bullet weights common in short-barreled builds.

Buy the Q LLC Sugar Weasel Complete Upper

Order the Q LLC Sugar Weasel upper from our Lubbock, Texas gun shop as soon as it’s available to ship. See the full lineup of Q LLC AR15 uppers to complete your build.