When firing a PDW-style pistol, control is imperative. DoubleStar introduces the new Strongarm Pistol Brace. Machined from billet aluminum, the Strongarm provides a rock-solid plate that fits securely on most AR-style pistol buffer tubes with two clamp screws. For added control, the Strongarm also comes with a Velcro strap to secure the pistol to your forearm for easy one-handed shooting. The Strongarm Pistol Tube is the newest revision to our line of pistol buffer tubes. This tube not only incorporates a non-rotating QD swivel pocket in the rear of the tube, but also our SOCOM Lock Nut system to eliminate any chance of the tube coming loose during use. Designed for use with the Strongarm Pistol Brace, the new Strongarm Pistol Tube is a rock solid solution for your AR-15 pistol builds. So this package is everything you need to complete your AR pistol build.

Features and Specifications:
Weight: 4.8 oz.
Material: 6061 Aluminum
Finish: Anodized
Diameter: 1.2"
Length: 1.9"
Strongarm Pistol Buffer Tube
Non Rotating Quick Detach Swivel Pocket
Ace SOCOM Lock Nut
Made in the United States

Fits:

AR-15 lower receivers

Note: Here is the NRA's interpretation of the latest ATF letter regarding the use and legality of pistol braces.
  NRA Interpretation of Latest ATF Letter