One piece body, machined from aircraft-grade aluminum alloy. Mount replaces the dust cover. Superior design with integral sliding rail system allows for quick and friendly installation and does not require locking plates. Takes standard Weaver type rings and has plenty of slots for scope or accessory placement. Optimum height/width clearance for all popular scopes. . Larger ejection port for optimum performance. Inch and metric compatible. Accommodates aftermarket T-Bars for SUITS. Lower Weaver base allows the use of iron sights.