Anderson AM-15 .50 Beowulf (12.7x42) Custom AR-15, 18.5 in Stainless Heavy Barrel, Muzzle Brake, Free-Float KeyMod, A2 Stock, Red/Green Dot & Bipod
This custom Anderson AM-15 is configured for the powerful .50 Beowulf (12.7x42) cartridge and built around an 18.5 in stainless heavy barrel with a threaded, radial-ported muzzle brake. It features a free-float KeyMod handguard with a continuous T-marked Picatinny top rail, a flat-top A3 upper with forward assist and brass deflector, and a fixed A2 stock. An open reflex red/green dot optic and a rail-mounted adjustable bipod are installed, and the package includes both 10-round and 3-round magazines.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are some mild exterior wear marks and light scuffs from prior handling.
What’s Included
- Open reflex red/green dot sight, multi-reticle (installed)
- Rail-mounted adjustable bipod (installed)
- 1x 10-round STANAG-pattern aluminum magazine
- 1x 3-round STANAG-pattern aluminum magazine
The .50 Beowulf chambering (12.7x42) gives this AM-15 a distinctive role, supported by an 18.5 in stainless heavy barrel for heat management and durability. The barrel is threaded and fitted with a radial-ported muzzle brake, and it bears a partial 12.7x42-style caliber marking near the muzzle.
The rifle uses a direct impingement system and includes a manual safety. The upper is a flat-top A3 with forward assist and brass deflector, providing a familiar control layout and robust function. Capacity is reported at 10+1, and two magazines are included for flexible use and transport.
Its free-float aluminum KeyMod handguard reduces contact with the barrel and offers attachment points, while the receiver and handguard share a continuous, T-marked Picatinny top rail for consistent mounting along the full length. The lower is marked ANDERSON MANUFACTURING – HEBRON, KY with the running-horse logo and MULTI-CAL.
Furniture is classic and durable: a fixed, rifle-length A2-style polymer buttstock with sling swivel and a matching A2 polymer pistol grip. Length of pull measures 13.75 in. An open reflex red/green dot sight is mounted on the receiver rail, and a rail-mounted adjustable bipod is installed, rounding out a ready-to-use configuration.