LAR-15M .450 Bushmaster from Rock River Arms

Modern Straight Wall Hunting Rifle

Colona, IL – Rock River Arms just introduced a new .450 Bushmaster carbine. This entry into RRA’s LAR lineup was developed as a modern hunting firearm with dominant short- to mid-range capabilities.

LAR-15M .450 Bushmaster from Rock River Arms. Read about the field test that wrote about.
Read about the field test that wrote about.


The RRA LAR-15M .450 Bushmaster produces new advantages for modern hunters using straight wall cartridges. Delivering the same 1 MOA @ 100 yards accuracy expected from RRA’s precision rifles, the .450 Bushmaster features a 16-inch stainless-steel cryo-treated barrel with smooth rifling (1:24 twist) and equipped with an RRA Operator Brake. The RRA two-stage trigger provides a crisp break and is housed in the RRA winter trigger guard, allowing full dexterity while wearing gloves.

The LAR-15M .450 Bushmaster from Rock River Arms is M-Lok compatible with a lightweight, free-float rail.
M-Lok compatible with a lightweight, free-float rail.

The RRA LAR-15M .450 Bushmaster comes standard with a six-position Operator CAR stock, overmolded A2 pistol grip, and 13-inch extended lightweight free-float handguard covering a low-profile gas block and mid-length gas system. The full-length top rail configuration fits all quality optic systems while the M-LOK compatibility provides for accessory attachments, such as a bipod and light source. A sturdy hard-plastic, five round polymer magazine, owner’s manual and warranty are included with the rifle.

LAR-15M .450 Bushmaster Specifications

Caliber: .450 Bushmaster

  • Lower Receiver: Forged RRA LAR-15M Multi-Caliber Marked
  • Upper Receiver: Forged A4
  • Barrel: 16-Inch Cryo-Treated Stainless, 1:24 Twist, 5/8-32 Thread
  • Muzzle: RRA Operator Brake
  • Gas Block: Low-Profile Gas Block, Mid-Length Gas System
  • Trigger: RRA Two-Stage / RRA Winter Trigger Guard
  • Safety: RRA Standard
  • Handguard: RRA 13-Inch Lightweight Free-Float, M-LOK Compatible
  • Buttstock: RRA Operator CAR Stock
  • Pistol Grip: RRA Overmolded A2 Grip
  • Weight (w/empty magazine): 6.8 lbs.
  • Length: 37.5-Inches Extended
  • Accuracy: 1 MOA at 100 Yards
  • Includes: One Magazine, RRA Case, Manual, and RRA Limited Lifetime Warranty
  • MSRP: $1100

Learn more about Rock River Arms’ complete line of production AR15-style rifles and accessories:

Just a couple of weeks ago, Rock River Arms launched the LAR-15M .350 Legend. Be sure to check that one out too.

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