AR-15 chambered in 5.56x45mm NATO and accepts .223 Remington. Mid-length, low profile multi/mode adjustable gas block. Upper receiver: Forged Type III hard coat anodized aircraft grade 7075-T6 aluminum flat top with forward assist and M4 feed ramps. Lower receiver: Springfield Armory proprietary machined aircraft grade 7075-T6 billet with ACCU-TITE tension system and QD swivel mounting points. Sixteen inch light weight profile chrome-moly vanadium barrel with 1:8 inch twist rate and melonite finish. Internally/externally with a unique Springfield Armory multiport muzzle break. Low profile flip-up sight, dual aperture rear sight, 1/2 MOA windage adjustable; fixed A2-style front sight. Bravo Company Mod 3 pistol grip. Springfield Armory proprietary modular match short reset single stage trigger. Integral to receiver trigger guard. Ambidextrous safety selector. Handguard: Springfield Armory full-length aluminum free floating with Springfield Armory locking tabs, compatible with M-Lok accessories. Bravo Company Mod O SOPMOD butt stock. Carbine "H" heavy Tungsten buffer assembly. Mil-spec dimension carbine receiver extension manufactured from 7075-T6 Type III hard anodized aluminum. Springfield Armory proprietary mid-size charging handle. Enhanced M16 Melonite finish MPT tested 9310 steel bolt. Includes one Magpul PMAG Gen M3 magazine. Length: 35.5 inches fully extended; 32.25 inches collapsed.
| Attribute | Value |
| Long Gun Web Model | Saint |
| Barrel Length | 16 |
| Made In The USA | Made In The USA |
| Caliber | 5.56mm NATO |
| Capacity | 30 |
| Caliber-Gauge | .223 REM. |
| Manufacturer Part Number | STE916556B |