The AR-50A1 National Match is similar to the standard AR-50A1 with some very important differences. The AR-50A1 NM is produced from selected components: The National Match's 33 inch barrel is three inches longer than the standard AR-50A1's barrel. The barrel has eight flutes. The flutes help with cooling and reduce unnecessary weight while maintaining accuracy-enhancing stiffness. The barrel has a 50 BMG Match chamber instead of a standard military chamber. ArmaLite has also developed a Skid System for the AR-50A1 National Match. It's meant for serious match use and comes standard. The ArmaLite Skid System provides parallel rests on the rifle that are parallel with the bore of the rifle so when it recoils it will recoil straight back. This has been requested by match shooters, some of whom have made their own. The front skid attaches to the slot in the forestock similar to the way bipod rails are attached. The rear skid attaches to the buttstock. Armalite developed the Skid System without modification to the AR-50A1 s original parts so the system can be used by shooters who already own an AR-50A1 and want to use their original stock with no modifications. The heart of the rifle is its metallic stock-to-action interface. The patented V-Lock Bedding Wedge and V-Block Stock assure absolute strength and repeatability for superb accuracy. The aluminum stock reinforces the receiver like a bench-rest sleeve. It's not just the bedding that improves accuracy. Independent testing has proven the AR-50A1 muzzle brake to be the best in the industry for both recoil control and accuracy. It scrapes away turbulent muzzle gasses and lets the bullet break into clean air for amazing accuracy.