National Match Bolt Carrier by Young Manufacturing, Inc. This bolt carrier is 1/2 oz heavier and has more surface area at the carrier front. These additions provide improved alignment of the bolt carrier as it moves in the receiver, tighter tolerances, more consistent bolt-lockup, and generally much smoother operation. This bolt carrier causes less wear, improved accuracy, and overall better function. All Y/M carriers are made using these high standards. The extra precision, quality, and post production processes are among the reasons top custom companies choose Young Manufacturing, Inc bolt carriers. You should too! (Available in AR-15 and M-16)   Features: 1⁄2 oz heavier than standard carrier Full diameter at carrier front provides increased support and alignment strength in battery position Carriers precision ground between centers after heat treatment Removes distortions from heat treat process Ensures straightness and accuracy Full hammer ramp machined for smoother operationWeight- 11.40 oz**Properly Staked by Rainier Arms***