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Model: PSA Full Size 5.7 Rock Caliber: 5.7x28mm Capacity: 23+1 Weight with Empty Mag: 25 oz Barrel Material: Carbon Steel With QPQ Finish; Fluted Barrel Length: 5.2" Twist Rate: 1/9" Thread Pitch: 1/2x28 TPI Slide Material: 416 Stainless Steel with QPQ Finish Action: Delayed Blowback Striker-fired Mag Catch: Reversible Safety: Trigger & Striker Accessory Rail: Picatinny Magazine: 23rd Steel 5.7x28mm Magazine (Ships With 2) Designed to work with Glock™ compatible sights **While this magazine will fit in a Ruger 5.7 mag well, we cannot guarantee that they will function in a Ruger 5.7 Pistol *Due to geometry differences, the 5.7 Rock 23 round *magazine will fit in a Ruger 5.7 Pistol as well as our 5.7 Rock pistol, however, function cannot be guaranteed. A 20-round Ruger 5.7 magazine will NOT work in a 5.7 Rock.