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The Ruger P90DC is a rugged, full-size DA/SA .45 ACP pistol produced from 1991–2013, featuring a 4.5" barrel and 8+1 capacity. Known for reliability and durability, it features an aluminum alloy frame, steel slide, and ambidextrous decocker. It is known for its wide grip, 34-ounce weight, and accuracy. 
Key Specifications of the P90DC:
Action: Double-Action/Single-Action (DA/SA) with slide-mounted decocker.
Caliber: .45 ACP.
Capacity: 8+1 rounds (standard); 7-round versions exist.
Barrel Length: 4.5 inches.
Overall Length: 7.75–7.8 inches.
Weight (Unloaded): Approximately 34 oz.
Frame: Aluminum alloy (hard-coated).
Slide: Carbon steel or stainless steel.
Sights: Fixed 3-dot. 
Features & Characteristics:
Safety/Decocker: Ambidextrous, slide-mounted.
Construction: Uses investment casting for, well, a durable but plain aesthetic.
Trigger Pull: Approx. 10 lbs (DA), 4 lbs (SA).
Recoil: Low, due to the weight and design.