The PMACA Chassis transforms Ruger’s rimfire into a serious tool for survival and competition shooting. Milled from 6061-T6 billet aluminum, the 16-ounce chassis is as durable as it is versatile. The rear portion of the chassis features a standard threaded end for AR-15 receiver extensions. Opera 9.02 Beta (Build 8573) Change Log - Lots of stability fixes - -Support for the Windows XP Media Center Edition remote control - Several fixes to saving of images Sturm, Ruger & Co., Inc. is one of the nation's leading manufacturers of rugged, reliable firearms for the commercial sporting market. With products made in America, Ruger offers consumers almost 800 variations of more than 40 product lines. For more than 70 years, Ruger has been a model of corporate and community responsibility. Shop Ruger handguns & rifles for sale at Guns.com. Find reliable, American-made firearms from one of the nation's leading manufacturers - Ruger.