--- title: "Rock Island STK100 9mm Optics Ready – Black" description: "Rock Island Armory STK100 9mm pistol with 4.5\" barrel, 17-round mag, and optics-ready slide. All-metal frame in matte black. Reliable and ready to run." canonical_url: "https://www.kygunco.com/product/rock-island-stk100-9mm-optics-ready-4.5-17rd-black-w-3-dot-fixed-sights" meta: author: KYGUNCO "og:description": "Rock Island Armory STK100 9mm pistol with 4.5\" barrel, 17-round mag, and optics-ready slide. All-metal frame in matte black. Reliable and ready to run." "og:image": "https://cdn.kygunco.com/assets/products/272522/thumbnail.jpg?v=1747840483" "og:image:height": "500" "og:image:width": "500" "og:title": "Rock Island STK100 9mm Optics Ready – Black" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Guns](https://www.kygunco.com/category/shooting/guns) / [Handguns](https://www.kygunco.com/category/shooting/guns/handguns) / [Semi-Auto](https://www.kygunco.com/category/shooting/guns/handguns/semi-auto) / RCK-57113 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/272522/main.jpg?v=1747840483) For illustration purposes only, this image may not be an exact representation of the product. # ROCK ISLAND STK100 9mm Optics Ready 4.5" 17rd - Black The STK100 Ultra HC offers precision and reliability with an optic-ready slide for easy red dot mounting, lightening cuts, and serrations that reduce weight for smoother handling. Designed with a modular aluminum frame and Parkerized finish for durability, this pistol boasts a 17-round capacity and ergonomic features for a seamless shooting experience. 5.0 ** ** ** ** ** [3 reviews](#reviews) $332.99 ** 5 interest-free payments of **$66.60** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) Pay over time with ![Credova text logo](https://www.kygunco.com/brands/credova-text.svg) ** Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** Ships To FFL Dealer Handled by our expert shippers in Bardstown, KY. ** Check Local Restrictions Not sure whether this item can be shipped to your area? Enter your ZIP code for a quick check. Item # 272522 Style RCK-57113 UPC 4806015571131 Condition New Manufacturer [Rock Island Armory](https://www.kygunco.com/brand/rock-island) Model STK100 Finish Black Round Capacity 17 Caliber 9mm Action Double/Single Action Barrel Length 4.5 in The **STK100 Ultra HC** boasts an **optic-ready slide**, allowing for easy mounting of red dot sights for enhanced precision. Its **lightening cuts and serrations** reduce weight and improve handling, ensuring a smoother shooting experience. Equipped with **3-dot fixed sights**, it provides a reliable sight picture for quick target acquisition. The **modular aluminum frame** offers strength and rigidity while maintaining a lightweight profile. This design, paired with the pistol's **Parkerized finish**, ensures durability and resistance to wear. With its **17-round capacity** and ergonomic design, the STK100 Ultra HC delivers a high-performance shooting experience. - Frame: Steel Frame - Stock/Grips: Black Aluminum - Sights: 3-Dot Fixed Sights - Finish: Parkerized - Weight: 1.8 lbs. - Rate of Twist: 1-in-16 - Magazines Included: 2 (17-round capacity) Shop with KYGUNCO for the best selection, competitive pricing, and exceptional customer service. Experience the difference that comes with buying from a trusted outdoor retailer with over 20 years of experience in the industry. ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 5.0 ** ** ** ** ** 3 reviews ** ** ** ** ** 3 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## Reviews ** Eugene STATESBORO, GA I can't say anything bad about the Rock Island STK100 9mm. It is a great gun. I haven't had any issues with this gun so far, probably put 200rds threw it so far 115grain and 124grain not even 1 jam. I'm impressed with it so far.. Would recommend this!!!! 7/10/2025 ** ** ** ** ** ** Albert Big Spring, TX gen 1-4 17 barrel will fit on this version. I have tried it with my buddy's G17. I ordered a threaded gen 1-4 barrel for it to run suppressed since it has the taller sights.Also plan on running an optics. I shot a couple hundred rounds through it an no hiccups. The mag well is too shallow and you're limited to types of mags that'll work with it. I got a Mec gar mag and ground it down. Id been using that over the KCIs that come factory. Never trusted them in a defensive pistol. The finish on the frame easily wears off, but for the price you cant beat it. Shoots smooth and soft. The grouping i get from this isn't as tight as other clones, could be the barrel twist. other than that, there is no functional issues. 6/14/2025 ** ** ** ** ** ** Verified Customer I have plenty of other pseudo-Glock pistols, but none with a metal frame. Especially one in its second iteration (Ultra) where you assume they've corrected any shortcomings from the first go-round. I like the feel in the hand, the feature-set, and that it still takes Glock magazines. I just wish the flared magwell was detachable because it will not work with the new metal 18 round mags from Mecgar. Most of all, a great price and quick shipment from KYGUNCO. 6/13/2025 ** ** ** ** ** ## Don't Forget Your Ammo ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/rock-island-stk100-9mm-optics-ready-4.5-17rd-black-w-3-dot-fixed-sights#webpage","@type":"WebPage","description":"Rock Island Armory STK100 9mm pistol with 4.5\" barrel, 17-round mag, and optics-ready slide. All-metal frame in matte black. 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It is a great gun. I haven't had any issues with this gun so far, probably put 200rds threw it so far 115grain and 124grain not even 1 jam. I'm impressed with it so far.. Would recommend this!!!!","reviewRating":{"@type":"Rating","bestRating":5,"worstRating":1,"ratingValue":5},"datePublished":"2025-07-10T18:20:24.7175829+00:00","author":{"@type":"Person","name":"Eugene"},"inLanguage":"en"},{"@type":"Review","name":"Review for ROCK ISLAND STK100 9mm Optics Ready 4.5\" 17rd - Black","reviewBody":"gen 1-4 17 barrel will fit on this version. I have tried it with my buddy's G17. I ordered a threaded gen 1-4 barrel for it to run suppressed since it has the taller sights.Also plan on running an optics. I shot a couple hundred rounds through it an no hiccups. The mag well is too shallow and you're limited to types of mags that'll work with it. I got a Mec gar mag and ground it down. Id been using that over the KCIs that come factory. Never trusted them in a defensive pistol. The finish on the frame easily wears off, but for the price you cant beat it. Shoots smooth and soft. The grouping i get from this isn't as tight as other clones, could be the barrel twist. other than that, there is no functional issues.","reviewRating":{"@type":"Rating","bestRating":5,"worstRating":1,"ratingValue":5},"datePublished":"2025-06-14T03:54:14.0149011+00:00","author":{"@type":"Person","name":"Albert"},"inLanguage":"en"},{"@type":"Review","name":"Review for ROCK ISLAND STK100 9mm Optics Ready 4.5\" 17rd - Black","reviewBody":"I have plenty of other pseudo-Glock pistols, but none with a metal frame. Especially one in its second iteration (Ultra) where you assume they've corrected any shortcomings from the first go-round. I like the feel in the hand, the feature-set, and that it still takes Glock magazines. I just wish the flared magwell was detachable because it will not work with the new metal 18 round mags from Mecgar. 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