Rock Island Armory STK100 Ultra 9mm Luger, Full-Size Aluminum-Frame Striker-Fired Pistol, 4.49 in Barrel, 17+1, Optic-Ready, Black
This Rock Island Armory STK100 Ultra stands out as an all-metal, aluminum-frame striker-fired 9mm with a PECVD-coated slide, barrel, and chassis. It is a recent full-size release with an optic-ready slide, factory fixed sights, and a flat-faced trigger. The package includes two 17-round magazines, optic adapter plates, the original box, and a zippered soft case.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are markings from previous handling and use on exterior surfaces. Please refer to the photos for details.
What’s Included
- Original Rock Island Armory factory box
- Rock Island Armory zippered soft pistol case
- Two 17-round STK100 double-stack 9mm magazines with STK-marked baseplates
- RMSc and RSH optic adapter plates
- Rock Island Armory STK100 owner's manual
The Ultra submodel pairs an aluminum frame with an all-metal striker-fired design, delivering a robust build in a full-size format. The frame features an extended beavertail and an undercut trigger guard for a controlled, high grip, along with aggressive textured panels for traction.
The slide is optic-ready with a removable cover plate, and it includes front and rear cocking serrations for positive manipulation. Factory fixed sights are fitted, with a screw-retained front sight.
The 4.49-inch barrel uses 6-groove rifling with a 1:10 right-hand twist. Capacity is 17+1, and this pistol comes with two factory STK100 magazines. The flat-faced trigger and trigger safety align with the striker-fired action for consistent operation.
Protective finishes include a black PECVD coating on the slide, barrel, and chassis, with small parts parkerized, and a black anodized aluminum frame. A three-slot Picatinny accessory rail on the dust cover supports common light or laser attachments. Factory labeling notes "Ultra V3 – PECVD" and "Made in the Philippines," with import markings "APINTL – Pahrump, NV – ACP Philippines."