Spike's Tactical ST-15 5.56 NATO AR-15 Rifle, 16 in Barrel, Drop-In Quad-Rail, ACE Skeleton Stock, 1:9 Twist
This Spike's Tactical ST-15 is a custom-configured AR-15 in 5.56 NATO built around a 16-inch, 1:9 twist steel barrel and a carbine-length drop-in quad-rail retained by a delta ring and front cap. It features an ACE Ltd. fixed skeleton stock with foam overtube, a flat-top A3 upper with T-marked rails, and a closed-end birdcage flash hider. The bore is bright and clean, and the rifle comes with a Magpul PMAG and an installed single-point sling.
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 - Sharp lands and grooves.
Specific Condition Notes: Markings from previous handling and use are present. A DIY color fill has been applied to the receiver markings. Refer to photos for additional cosmetic details.
What’s Included
- Spike's Tactical ST-15 rifle (5.56 NATO)
- 1x 30-round Magpul PMAG (polymer)
- Single-point sling (installed)
- ACE Ltd. USA fixed skeleton stock with foam overtube (installed)
- UTG finger-groove pistol grip (installed)
- Carbine-length drop-in quad-rail handguard (installed)
- CAA and Mission First Tactical rail covers (installed)
- Vertical foregrip (installed)
- Closed-end birdcage flash hider (installed)
The ST-15 receiver set carries Spike's Tactical markings with the spider logo (red hourglass), "CAL - MULTI," and "MOD - ST15," with the right side marked "SPIKE'S TACTICAL, APOPKA, FL, U.S.A." The lower includes selector pictograms for three positions on this semi-automatic configuration. The flat-top A3 upper features a forward assist, case deflector, and ejection-port cover, with T-marked Picatinny on the receiver and handguard.
The rifle uses a direct impingement system with a low-profile, set-screw gas block positioned forward of the handguard (exposed). Its 16-inch steel barrel has a step profile and is rollmarked "SA 5.56 NATO 1/9," indicating a 5.56 NATO chamber and 1:9 twist. The muzzle is threaded and fitted with a closed-end birdcage flash hider.
Furniture and controls are configured for a solid, streamlined setup. An ACE Ltd. USA fixed skeleton stock with foam overtube provides a length of pull of approximately 13.75 inches. The UTG finger-groove pistol grip and a vertical foregrip mounted on the 6 o'clock rail complement the carbine-length drop-in quad-rail. CAA and Mission First Tactical rail covers protect unused sections and improve handling.
This ST-15 uses the AR-15/STANAG magazine interface and includes one 30-round Magpul PMAG. It ships with an end-plate single-point sling loop and an installed single-point sling. No sights are installed, and the top rail surfaces are T-marked for consistent accessory placement.