The 4.5 Inch Barrel Extension is currently not available at this time. We strive to provide the highest quality products to our customers and should have this product back in stock at the earliest time possible.

This is a 4 1/2" barrel extension to bring the length of your AMD barrel to a legal 16 1/2". It has internal 14 x 1 LH threads on one end and is threaded on the other end to accept any 14 x 1 LH muzzle brake.