This CMC Products Match Grade magazine is based off of a traditional USGI-style fixed base magazine with improvements in follower design, feed lip geometry, and materials. Part of what leads these CMC magazine to have been given the Match Grade name is the fact that tolerances are held to +/- .001", which is more than 75% tighter than magazines made to typical military specifications. These have a stainless steel USGI style body with enhanced feed lips, a stainless steel follower, and a high tensile rocket wire spring. Numbered witness hole allow for a visual round count. 9mm Fits All Compact (Officer's Model) 1911 Handguns 8 Round Capacity Mfg: Chip Mccormick Custom