Rock River Arms LAR-15 Varmint A4 5.56 NATO, 20-inch Stainless Bull Barrel, Free-Float Rail, Magpul PRS Gen2
This Rock River Arms LAR-15 Varmint A4 is configured for precision with a 20-inch stainless heavy bull barrel, a free-floated aluminum handguard, and a Magpul PRS Gen2 adjustable stock. The A4 flat-top upper provides a full-length Picatinny rail, and the rifle includes two magazines and the factory hard case with a matching AR1520 label. It is a clean, purpose-built AR-15 platform in excellent condition.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: There are minimal markings from previous handling and use. Please refer to the photos for additional detail.
What’s Included
- Rock River Arms factory hard case with fitted foam (case label indicates AR1520 20" A4 Varmint and matches the rifle serial)
- 1x 20-round aluminum USGI-pattern AR-15 magazine
- 1x 10-round Magpul PMAG polymer magazine
The LAR-15 Varmint A4 series centers on a 20-inch stainless heavy bull barrel that is unfluted and free-floated for stability and heat management. It features a recessed target crown and the muzzle appears unthreaded, aligning with its precision-focused build.
The A4 flat-top upper includes a full-length Picatinny rail with no iron sights installed, plus a forward assist, case deflector, and ejection-port dust cover. The free-float aluminum handguard provides a continuous top rail and bolt-on Picatinny sections at 6 o’clock for accessories as needed.
The stock is a Magpul PRS Gen2 adjustable precision model, offering an adjustable cheek riser and length of pull (approximately 13.5 inches). A rubberized finger-groove pistol grip enhances control, and the rifle uses a standard AR-15 detachable magazine interface with a manual safety.
Construction highlights include aluminum receivers with a matte anodized black finish and a stainless-steel barrel. This semi-automatic, direct-impingement platform is chambered in 5.56 NATO with a 20+1 capacity. The factory case label denotes "20" A4 VARMINT RIFLE (2013+)" and part number AR1520, with information matching the rifle’s serial prefix.