The JE Machine AR-15 ultra-lightweight Skeletonized Pistol Stabilizer Blade is manufactured to exacting tolerance and fits pistol buffer tube. The stabilizer improves your marksmanship by providing additional support for your pistol when you operate your AR pistol with one hand. The design incorporates a vertical fin, which you stabilize against the inside of your forearm when in the firing position. Install within minutes, just slip it on and tighten the large set screw for a rock-solid installation.