PSA 5.7 Rock RK1 5.7x28 Full-Size Pistol - Threaded 5.2 in Barrel, Optics Cut, Two-Tone, 23+1
This Palmetto State Armory 5.7 Rock RK1 stands out with its vented slide, threaded 5.2 in barrel, and optics-cut configuration. It includes two 23-round steel magazines, suppressor-height iron sights, and an installed RMR-footprint optics plate. Built in West Columbia, South Carolina, it features a two-tone finish with a gray polymer frame and a 416 stainless slide.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Shows minimal signs of prior use. The bore is clean and shiny.
What’s Included
- Two 23-round steel 5.7x28 magazines (baseplates marked '5.7x28')
- RMR-footprint optics mounting plate (installed)
- 1/2x28 thread protector (installed)
The RK1 variant adds vented slide windows and a threaded barrel to the 5.7 Rock platform. The slide is machined from 416 stainless steel, while the 5.2 in carbon-steel barrel wears a QPQ finish for durability. Six-groove rifling with a 1:9 RH twist supports 5.7x28 mm performance, and the pistol uses a delayed blowback, striker-fired action.
The barrel is threaded 1/2x28 and ships with a thread protector installed. Suppressor-height iron sights pair with the raised sight picture, and the slide features an optics cut. It directly accepts Shield RMS-size optics, and the included plate provides RMR-footprint compatibility. Glock-pattern sight cuts broaden iron sight options.
The full-size gray polymer frame provides molded texturing for control and integrates a 3-slot accessory rail on the dustcover. Safety features include a trigger safety and a striker block. The two-tone finish gives the pistol a clean, modern appearance.
Capacity is 23+1, and this example includes two steel magazines. The rear sight is a dovetailed square-notch, and the front is a tall metallic blade, complementing the slide’s optics-ready configuration.