MADE by BROWNELL's 10 Round Magazines for most 1911 Conversion Kits should work with Marvel, Nighthawk, Advantage Arms, Kimber, STI andTactical Solutions Conversions Polymer Construction Durable polymer construction will hold up to extended use Feed lip geometry has been optimized to improve feeding. Follower has been designed to improve round stacking, to prevent misfeeds. Magazine base pad is removable for maintenance and the body is slightly textured to ensure a positive grip. Follower features a load assist, which can be manipulated by hand or with a tool 1/8" in diameter. Magazine not compatible with Ciener 1911 22LR Conversions.