Stag Arms STAG-15 5.56 NATO AR-15, 16-in Threaded Barrel, Model 3T Style, Diamondhead Free-Float Handguard, Flip-Up Sights
This Stag Arms STAG-15 stands out as a Model 3T–style configuration with Diamondhead USA components, a 16-inch 5.56 NATO barrel, and a free-float aluminum handguard. It features a flat-top A3 upper with a T-marked Picatinny rail, flip-up sights installed, and a Connecticut-marked receiver from the brand’s pre-relocation era. The rifle comes in excellent condition and includes a 30-round magazine and the factory manual.
Built on the AR-15 platform with a direct-impingement system, this semi-automatic STAG-15 uses a 16-inch threaded barrel capped with an A2-pattern flash suppressor. It offers a 30+1 capacity and right-hand ejection, combining familiar ergonomics with proven parts compatibility.
The flat-top A3 upper provides a T-marked Picatinny rail, forward assist, shell deflector, and ejection port cover. Flip-up front and rear sights are installed, giving you a ready-to-use sighting setup paired with the continuous top rail.
Diamondhead USA’s free-float aluminum handguard includes a continuous 12-o’clock rail, elongated vent slots, and a scalloped lower surface. This complements the rifle’s matte black finish and keeps the forend slim and functional.
Furniture includes a 6-position M4-style collapsible stock with an integral sling loop and an A2-style polymer pistol grip. The length of pull is listed at 14.0. The rifle is made in the USA, uses STANAG magazines, and includes one 30-round magazine.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: This rifle shows minimal markings from previous handling and use.
What’s Included
- 1x 30-round magazine
- Stag Arms owner's manual
- Flip-up front and rear sights (installed)