Stag Arms Stag-15 Model 3T 5.56mm NATO 16in Semi-Auto AR-15 Rifle with DiamondHead Free-Float Handguard
This Stag Arms Stag-15 Model 3T is a USA-made AR-15 platform rifle chambered in 5.56mm NATO with a 16in barrel and direct-impingement, semi-automatic action. It is configured with a DiamondHead USA free-float ventilated handguard featuring elongated slot cutouts and a continuous top rail, along with rail-mounted flip-up iron sights. The rifle is finished in matte black and includes the original hard case labeled for the Model 3T, with a matching serial number on the receiver and case label.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Metal Condition: Good condition, showing some signs of prior use and handling.
Wood Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Action Condition: Good condition, showing some signs of prior use and handling.
Mechanics: The mechanics are sound and the firearm functions properly.
Cosmetics: This firearm is in solid shape. There are some scratches and blemishes present. Bore is clean and shiny.
What's Included
- Original hard case (Model 3T labeled)
- 1x 30-round Magpul PMAG AR/M4 Gen M3 polymer magazine
- Rail-mounted flip-up iron sights (front and rear), installed
- Magpul pistol grip, installed
- Magpul RVG vertical foregrip, installed
Built as a Stag-15 Model 3T (code S013025SA3T), this rifle is marked "STAG ARMS / NEW BRITAIN, CT / USA" on the receiver, with "MODEL STAG-15 / CAL MULTI" markings. The included original hard case is labeled for the Model 3T and shows a matching serial number to the receiver.
The configuration includes a DiamondHead USA free-float ventilated handguard with elongated slot cutouts and a continuous top rail, plus a flat-top upper with a full-length top Picatinny rail for mounting accessories. The upper also includes a forward assist and a dust cover.
For handling and controls, it is equipped with a black polymer adjustable, telescoping stock and a manual safety selector with SAFE/FIRE positions. Magpul furniture includes an installed Magpul pistol grip and Magpul RVG vertical foregrip.
The 16in barrel is threaded and fitted with an A2-style birdcage flash hider. This listing also includes a stated length of pull of 11 and 14.




