The Spike’s Tactical ST9 (brand part no. STLS910) is a 9mm Luger stripped AR-15 lower receiver built to accept Colt-pattern magazines, giving builders access to widely available Colt-style 9mm AR magazines. Spike’s builds its lowers to the same high standards whether you’re planning an active build or setting a spare aside for later. Selling it stripped keeps cost down and lets builders choose their own trigger, safety, and buffer system to finish a 9mm pistol-caliber carbine build. It’s a solid option for builders who want to standardize on Colt-pattern 9mm magazines.

Key Specifications

• Chambered for 9mm Luger, built for pistol-caliber carbine operation.
• Accepts Colt-pattern magazines.
• Runs a semi-automatic action, standard for AR-15-pattern builds.
• Sold as a stripped receiver, giving full control over trigger and safety selection.
• Forged from 7075-T6 aluminum for mil-spec strength and durability.
• Finished in a Type III hard-coat anodize for wear and corrosion resistance.
• Machined with an integral trigger guard as part of the receiver body.
• Uses a dedicated magazine catch and ejector tuned for reliable Colt-pattern 9mm feeding.
• Compatible with standard AR-15 fire control components for trigger and safety selection.

Frequently Asked Questions

What magazines does this lower use? It’s built to accept Colt-pattern 9mm magazines.

Does it include a trigger or buffer tube? No, this is a stripped lower receiver sold without internals.

Buy the Spike’s Tactical ST9 9mm Stripped Lower Receiver

Standardize on Colt-pattern 9mm magazines with this stripped lower, part of our AR15 lowers selection. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.