LRB Arms M15SA .300 AAC Blackout AR-15 Rifle, 16-inch Stainless Heavy Barrel, Free-Float Quad-Rail, Fixed Skeleton Stock
This LRB Arms M15SA stands out as a .300 AAC Blackout AR-15 with a 16-inch stainless heavy-profile barrel, an A3 flat-top upper, and an Olympic Arms free-float quad-rail handguard. It features a threaded muzzle with a slotted device, a fixed skeletonized stock with a foam cheek rest, and a 30-round magazine marked specifically for 300 BLK. LRB AR-15 rifles are less common on the market, and the Olympic Arms-branded handguard is from a discontinued line of components.
Condition
Overall Condition: Good condition, showing some signs of prior use and handling.
Bore Condition: Good - Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling - Intact, well-defined lands and grooves.
Specific Condition Notes: This firearm is in solid shape and shows various cosmetic imperfections, including scratches, blemishes, and areas of finish loss. "300 Blackout" is written in sharpie in three locations on the barrel.
What's Included
- 1x 30-round polymer AR-15 magazine with hex-pattern body marked "300 BLK"
Built on the AR-15 platform, the M15SA uses a semi-automatic, direct impingement action in .300 AAC Blackout (7.62x35mm). It offers a 30+1 capacity and is equipped with a manual safety. Receivers are aluminum with an anodized finish, and the rifle is made in the USA.
The 16-inch stainless steel heavy-profile barrel is marked "SS 300 BLK" and is threaded, capped with a cylindrical slotted muzzle device. A low-profile railed gas block supports accessory mounting at the front.
An A3/flat-top upper includes a forward assist, brass deflector, and ejection-port cover. The Olympic Arms free-float quad-rail handguard provides Picatinny rails at 12, 3, 6, and 9 o'clock, and the upper's top rail serves as a scope/optic mounting surface. The rifle ships without sights.
The fixed skeletonized stock features a foam-covered buffer tube for a comfortable cheek interface and a rear sling loop; length of pull is 14.0 inches. An ergonomic finger-groove pistol grip rounds out the control set.
LRB AR-15 models are less commonly encountered, and the Olympic Arms-branded quad-rail component is from a discontinued line, adding context for buyers who follow parts provenance. The included polymer magazine is clearly marked for 300 BLK to support caliber identification.