R2S2 - 2 Round Holder M-LOK� - GTAC341 - READY TO SHOOT TWO- 2 Round spare ammo holder with M-LOK� mounting - Fits Most Common Rifle Rounds From .223 Up To .450 Legend - Black Anodized 2-Piece Aluminum Body - Durable Elastic Web Ammo Holder Loops - Fits Single M-Lok� Slot and Mounts w/ Single Screw + T-Nut - Designed For Easy Reloads On Bolt or Lever Action Rifles With M-LOK�