Rock Island Armory STK100 Ultra 9mm, Full-Size Striker-Fired, 4.49" Barrel, 17+1, Optic-Cut Slide, 7075-T6 Aluminum Frame
The Rock Island Armory STK100 Ultra is a full-size, striker-fired 9mm that stands out with its 7075-T6 aluminum alloy frame, optic-cut slide with cover plate, and a 17+1 capacity. This Ultra-series variant pairs practical features like 3-dot dovetailed sights and a 3-slot Picatinny accessory rail with thoughtful ergonomics, including a flat-faced trigger and a slightly flared magazine well. It is New and appears unused, and comes with three 17-round magazines plus factory packaging and accessories.
Condition
Overall Condition: New.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent - Sharp lands and grooves.
Specific Condition Notes: This pistol appears unused.
What’s Included
- Original factory box (label present)
- Rock Island Armory soft case with embossed crest
- Paperwork
- Optics plates
- Three 17-round steel double-stack 9mm magazines
The STK100 Ultra configuration delivers a full-size footprint with a 4.49" barrel and approximately 7.9" overall length, providing a 17+1 capacity in 9mm Luger. Its 7075-T6 aluminum alloy frame is a defining feature of this model and series, offering a durable foundation with textured frontstrap and side panels.
The slide is factory optic cut and ships with a cover plate. It features front and rear serrations for positive manipulation and relief cuts on the flats. Sights are a clean 3-dot setup with a dovetailed single-dot front and a dovetailed two-dot rear.
Controls and handling details include a flat-faced trigger with an integrated trigger safety and a slightly flared magazine well opening to assist with reloads. An integral 3-slot Picatinny accessory rail on the dustcover supports common weapon-mounted accessories.
This pistol is part of the STK100 Ultra series and is identified by RIA mfg part number 57113. Country of origin is the Philippines, with import markings noted as APINTL–PAHRUMP NV ACP PHILIPPINES. The package includes three 17-round magazines and the factory optics plates, offering immediate setup flexibility.