Rock Island Armory STK100 9mm | 4.5″ | 17+1 | MFG# 56625

The Armscor / Rock Island Armory STK100 is a full-size, striker-fired 9mm pistol with an aluminum frame and a 4.5-inch barrel. It ships with one 17-round magazine and an optics-ready rear plate, and is built to deliver controllable recoil and consistent performance for range use and personal protection. For a capable red-dot pairing under $1,000, consider a compact micro red dot such as the Holosun HS507C or a comparable low-profile reflex sight; those optics suit the STK100’s optics-ready plate and sighting plane without exceeding the budget.

Product Specifications

• The caliber is 9mm Luger.
• The capacity is 17+1 rounds.
• The barrel measures 4.5 inches.
• The action is Striker Fired.
• The frame material is Aluminum.
• The grip material is Aluminum (integrated on frame).
• The firearm is Optics Ready with a rear sight integrated on the optic cover plate.
• The pistol ships with 1 magazine (17 rounds).
• The overall length is 7.91 inches.
• The weight is listed as 28.80 oz (per provided specifications).
• The slide is described as serrated black anodized aluminum.
• The sights are fixed 3-dot front and rear on the optic cover plate.
• The frame finish is black anodized.
• The trigger pull is listed as 3.0 – 7.0 lbs.
• The UPC is 4806015566250.

The STK100 blends a metal frame feel with striker-fired simplicity to offer a stable shooting platform for extended range sessions and day-to-day carry in configurations where a full-size service pistol is preferred. Its textured, 1911-style grip angle and added frame mass help manage recoil and promote follow-up shot control while the optics-ready top plate allows mounting a compact reflex sight for faster target acquisition. The integrated accessory rail also supports common duty lights or training tools for range use.

Many users praise the aluminum grip for reducing felt recoil, and others note the textured, 1911-style grip angle provides improved control.

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