The San Tan Tactical STT-15 is an AR-15 pattern pistol chambered in 5.56 NATO/.223 Remington, built in a black finish. It has a 7.5-inch pistol-length barrel and a fully ambidextrous billet lower. The receiver set is a matched, hand-finished pillar billet pair, and the pistol-length gas system keeps the build compact while the manual of arms stays the same as a standard AR-15. 
 

Key Specifications 

• Brand: San Tan Tactical 
• Model: STT-15 
• Caliber: 5.56 NATO / .223 Remington 
• Action: Semi Auto 
• Capacity: 30 rounds 
• Barrel Length: 7.5 in 
• Color: Black 
   

Detailed Features 

• Matched, hand-finished pillar billet upper and lower receiver set 
• Fully ambidextrous lower with three QD attachment points for sling and accessory mounting 
• 7.5-inch pistol-length barrel paired with a matching gas system 
• Ships with a 30-round magazine loaded in the pistol 
• Semi-automatic AR-15 style safety and selector controls

Shooters who pick up the STT-15 usually comment first on how solid the billet lower feels compared to a standard forged AR-15 lower. The ambidextrous controls are a common highlight, especially for left-handed owners who no longer have to reach across the receiver for the safety or bolt release. Some buyers do note that the black finish shows holster and sling wear faster than they expected on a billet part.

Because it's built as a pistol-length AR, the STT-15 is easy to store and maneuver in tight spaces, but the shorter barrel brings more blast and a snappier recoil pulse than a rifle-length AR-15. Most owners end up pairing it with a brace or a red dot rather than trying to run it off iron sights alone.

On value, opinions vary. The pillar billet construction and QD attachment points are appreciated by people who want a more refined AR-15 pistol than an entry-level build, though the price premium over a basic mil-spec pistol build is a recurring point of debate. Owners who do the research on compatible parts generally come away satisfied with the STT-15's fit and function.