Angstadt Arms 9mm AR-15 Carbine Buffer Assembly

9mm Carbine Buffer Kit

A 9mm AR-15 needs a different buffer setup than a 5.56 rifle. Most 9mm ARs run blowback, which means the bolt stays closed through its own mass and spring pressure instead of a gas system, so the buffer has to be heavier to control bolt speed. Angstadt Arms packages the buffer, carbine spring and 9mm spacer as one kit for builders and owners setting up or refreshing the recoil system on a 9mm carbine-stock rifle or pistol-caliber carbine.

Features

• 5.4 oz Buffer — The added weight slows the bolt's rearward travel in a blowback 9mm action.
• 3.25-Inch Buffer Length — The buffer body measures 3.25 inches, sized for a carbine buffer tube setup.
• 0.75-Inch 9mm Spacer — The spacer sets the assembly's position in the tube to suit the shorter travel of a 9mm bolt.
• 4-Inch Overall Length — With buffer and spacer combined, the assembly measures 4 inches.
• Carbine Buffer Spring Included — A carbine-length spring comes in the kit, so you are not left matching parts from different makers.
• Carbine Stock Fit — Built for the carbine buffer tube, the receiver extension found behind collapsible AR stocks and braces.
• Glock and Colt Magazine Compatible — Works in 9mm ARs fed from either Glock-pattern or Colt-pattern (SMG-style) magazines.
• Anodized Black Finish — An anodized coating protects the buffer from wear and corrosion inside the tube.

Fit and Compatibility

This assembly is meant for 9mm AR-15 builds with a carbine-length buffer tube. It does not replace the buffer in a 5.56 rifle. The kit contains the buffer, carbine buffer spring and 9mm buffer spacer under manufacturer part number AA09BUFKIT, so one purchase covers the whole recoil assembly.