Spike's Tactical ST-15 .50 Beowulf AR-15 Semi-Auto Rifle, 16 Inch Barrel, Alexander Arms Upper, 5+1, Black
This custom big-bore AR-15 pairs a Spike's Tactical ST-15 lower with an Alexander Arms .50 Beowulf complete upper. It features a 16 inch barrel, a fixed A2-style stock, carbine-length Magpul MOE polymer handguard, flip-up iron sights, and an oversized two-port muzzle brake. The rifle is chambered in .50 Beowulf with a 5+1 capacity and comes with a 5-round Alexander Arms-marked magazine.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are scattered scuffs and areas of finish wear visible on exterior surfaces.
What's Included
- Spike's Tactical ST-15/.50 Beowulf semi-automatic rifle
- 1x 5-round STANAG-pattern metal magazine with Alexander Arms "50 BEOWULF" marked floorplate
This build uses an Alexander Arms "ALEX-A 50 BEO" marked complete upper on a Spike's Tactical ST-15 lower (marked "CAL MULTI" and "SPIKE'S TACTICAL APOPKA, FL U.S.A."). The barrel is clearly marked "50 BEOWULF," and the system runs a semi-automatic, direct-impingement action. It is configured for a 5+1 capacity.
The rifle is finished in black anodized aluminum and includes a forward assist, brass deflector, and an ejection-port cover. Selector pictogram markings are present on the lower. The upper receiver has a rail, and the gas block is railed to support the included sights.
Furniture is set up for control and durability: a fixed A2-style polymer stock with a rear sling loop and a 14.0 inch length of pull, plus an A2-style pistol grip with a finger ridge. The carbine-length polymer handguard features MOE slots for mounting accessories.
Sighting is handled by a bolt-on flip-up front sight mounted to the railed gas block and a flip-up rear sight on the receiver rail. At the muzzle, a threaded barrel is fitted with an oversized two-port brake secured by a jam nut.
Distinctive touches include biohazard engravings on the front takedown/pivot pin head and the ejection-port cover hinge pin head. The included metal magazine bears the Alexander Arms shield and "50 BEOWULF" on the floorplate.