Agency Arms Extended Magazine Release, Fits 3rd Generation Glocks, Anodized Finish, Black, Right Hand Only MR-G3-B The Agency Arms Billet Magazine Release is manufactured for a variety of GLOCK pistols. It features a serrated and enlarged face that is 3/64" longer than the standard magazine release. Machined from 6061 Aluminum and MIL-A-8625 Type 3 Hard Anodized. It will not fit wide frames or single-stack frames.