The Rock River Arms LAR-15M CAR A4 with gas block sight base is a carbine-length 5.56 NATO rifle that follows the classic A4 layout (brand part no. AR1850). A 16-inch chrome moly barrel ends in an A2 flash hider, and a gas block with a receiver-height sight rail replaces the traditional A2 front sight base. Rock River fits its two-stage Ultra Match trigger and a six-position tactical CAR stock. The result is a compact, adjustable rifle that suits home defense, training classes or a first AR purchase. It ships with a case, which makes it a complete package out of the box.

Key Specifications

• The chamber is 5.56mm NATO, which also accepts .223 Remington ammunition according to the maker.
• The barrel is a 16-inch chrome moly profile, a durable carbine-length choice for rifle shooters.
• The front sight is a gas block with a receiver-height sight rail, so a rear sight or optic and front sight line up at the same height.
• The muzzle device is an A2 flash hider on a 1/2×28 thread, which reduces visible flash and allows other devices to be fitted.
• The trigger is an RRA Two Stage Ultra Match design, giving a crisp break for accurate shooting.
• The handguard is a CAR-length handguard, keeping the front end short and light.
• The stock is an RRA six-position tactical CAR stock, adjustable for different shooters and gear.
• The grip is an RRA overmolded A2 grip, which offers a firm, familiar hold.
• Weight is 7.1 pounds and overall length is 36 inches, a handy size for a full-power rifle.
• Rock River rates accuracy at 1 MOA at 100 yards, and the rifle comes with one magazine, an RRA case, a manual and warranty information.

Frequently Asked Questions

What is different about the gas block sight base version? It uses a gas block with a receiver-height sight rail in place of the A2 front sight base, as Rock River Arms lists for this part number.

Can it shoot .223 Remington ammunition? Rock River Arms lists the chamber as 5.56mm NATO for 5.56mm and .223 caliber ammunition.

What comes in the box? The rifle ships with one magazine, an RRA case, a manual and warranty information.

Buy the Rock River Arms LAR-15M CAR A4 Rifle, 5.56 NATO, 16-Inch Barrel, Gas Block Sight Base

The CAR A4 keeps the proven carbine formula and adds a match-grade two-stage trigger. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more AR rifles from Rock River Arms.