Rock River Arms LAR-15 CAR A4 5.56 NATO 16-inch AR-15 Carbine with Flat-Top Receiver, Pinned A2 Front Sight, and Threaded Barrel
This Rock River Arms LAR-15 CAR A4 is a 16-inch, direct-impingement 5.56 NATO carbine built on an A4 flat-top receiver with T-marked Picatinny rail. It features a pinned A2 front sight base, carbine-length gas system, and a threaded barrel with an A2 birdcage flash hider. Thoughtful upgrades include a Mission First Tactical BMS minimalist 6-position stock and a folding polymer rear sight. The package includes both 30- and 10-round PMAGs and a black web sling, and the bore condition is excellent.
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: Minor, superficial surface marks are present on exterior surfaces visible under close inspection. The bore exhibits a bright, mirror-like appearance.
What’s Included
- Rock River Arms LAR-15 CAR A4 semi-automatic rifle (5.56mm NATO)
- 1x 30-round Magpul PMAG polymer magazine (5.56x45)
- 1x 10-round Magpul PMAG polymer magazine (5.56x45)
- Black web sling
- Mission First Tactical BMS minimalist collapsible stock (installed)
- Folding polymer rear sight (installed)
The CAR A4 configuration uses an A4 flat-top upper with a T-marked Picatinny rail (T4–T12 visible) for consistent accessory placement. The receiver includes a forward assist, brass deflector, and ejection-port cover, and the rifle accepts standard STANAG-pattern magazines.
The 16-inch barrel is marked "RRA 5.56 NATO 1/9" and runs a carbine-length gas system. It is threaded and fitted with an A2 birdcage flash hider secured by a crush washer. The gas block/front sight base is pinned to the barrel and retains the A2 front sight with a bayonet lug and a bottom sling swivel.
Furniture includes carbine-length two-piece ribbed polymer handguards with round vent holes and a round delta ring. The installed Mission First Tactical BMS minimalist 6-position stock keeps the carbine light and handy, and the finger-grooved textured black pistol grip carries the RRA medallion. Sighting is handled by the fixed A2 front and a folding polymer rear sight.
Chambered in 5.56 NATO with a 1:9 twist, this LAR-15 is a United States-made AR-15 platform carbine. The LAR-15 line is noted for its selection in the 2003 DEA carbine contract, underscoring its place in the modern AR landscape. This example ships with both a 30-round and a 10-round PMAG and a black web sling.