SPECIFICATIONS 10-Round: 3.055” Outside Length 2.505” max cartridge overall length (COAL) with binder plate and spacer 3.90” Rear Height MDT 10-round magazines are approximately ¾” shorter in height than standard AICS 10-round magazines due to MDT’s unique Double Stack to Single Feed (DSSF) transition design, allowing easier mag changes when shooting prone. 10-round magazine includes 2 internal ribs that help reduce friction between the cartridge and magazine body and provide a smooth transition from a double stack to single feed at the top of the magazine. COMPATIBILITY 6mm BR Norma 6mm BRA 6mm BRX 6mm Dasher 22 BR Additionally, through testing, we have found that these magazines do not work out of the box with three lug actions. We have found you can make them work with some tweaking of the feed lips.