Rock River Arms LAR-15 Custom AR-15 Rifle in .300 AAC Blackout, 16-Inch, Matte Black
This Rock River Arms LAR-15 is a full-size, direct-impingement AR-15 platform rifle configured with a .300 AAC Blackout upper receiver marked by Advanced Armament Corp. It features a Knight's Armament URX II mid-length forend assembly and a LaRue-marked rail-mounted rear sight. With a reported 16-inch barrel and a 30+1 noted capacity, this is a clearly documented custom setup with identifiable, branded components throughout.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Specific Condition Notes: There are mild scuffs and areas of wear present.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
What's Included
- Rock River Arms LAR-15 rifle with AAC-marked .300 AAC Blackout upper installed
- 4x 30-round polymer Magpul PMAG magazines
- 1x 10-round magazine
- LaRue rail-mounted rear sight (installed)
- Vertical foregrip (installed)
The lower receiver is marked "ROCK RIVER ARMS" and "COLONA, IL" with model marking "LAR-15" and caliber marking "CAL. 5.56 MM." The installed upper receiver is clearly marked "300 AAC BLACKOUT (7.62x35mm) ADVANCED ARMAMENT CORP.," matching the listed chambering for this configuration.
Up front, this rifle is fitted with a Knight's Armament URX II mid-length forend assembly (P/N 20549), marked on the handguard. The setup includes a continuous Picatinny top rail on the flat-top upper, along with visible side and bottom rail sections on the forend for mounting support.
Sighting equipment includes a LaRue-marked rear iron sight mounted to the top rail. A vertical foregrip is mounted to the bottom rail, and the muzzle shows an A2-style flash hider profile.
The rifle wears a matte black finish and uses a collapsible, adjustable stock marked "STR" with a polymer pistol grip. Length of pull is listed at 13.5. The included polymer Magpul PMAG magazines show molded "PMAG" markings; some are marked "5.56x45" and have paint-marker notes such as "300" and "300 SUB."