Rock River Arms BLK1850 LAR-15M CAR A4 300 Blackout 30+1 16″, Black, R4 Handguard, Tactical Carbine Stock, Overmolded A2 Grip, Railed Gas Block

Rock River Arms BLK1850 LAR-15M CAR A4 300 Blackout 30+1 16″, Black, R4 Handguard, Tactical Carbine Stock, Overmolded A2 Grip, Railed Gas Block

$1,137.36

The Rock River Arms BLK1850 LAR-15M CAR A4 300 Blackout gives you a factory two-stage match trigger, a railed gas block, and a 16″ chrome-moly barrel in a ready-to-run carbine. It’s set up for optics, suppressors, and defensive use right out of the box.

Ships to all 50 states. Available nationwide.

SKU: TSW|148304 Category:

Description

The Rock River Arms BLK1850 LAR-15M CAR A4 300 Blackout 30+1 16″ in black is a factory-built carbine chambered for the versatile .300 Blackout cartridge. It combines a 16-inch chrome-moly barrel with an A2 flash hider, a two-stage match trigger, and an overmolded A2 grip. The R4 handguard and railed gas block give you solid mounting points for optics and accessories, while the tactical carbine stock keeps the weight balanced and the handling quick. This is a complete, ready-to-run rifle built on Rock River’s proven LAR-15 platform.

Manufacturer Rock River Arms
Model BLK1850 LAR-15M CAR A4
Material Chrome-moly steel barrel, aluminum upper/lower receiver
Compatibility All standard AR-15 lower parts, .300 Blackout magazines
Finish Black anodized aluminum, phosphate barrel
Weight 7.2 lbs (per manufacturer specs)
Condition New

Key Features

  • Two-Stage Match Trigger – Why it matters: This trigger breaks cleanly at 4.5 pounds, giving you a crisp, predictable pull that improves accuracy without the heavy creep of a standard mil-spec trigger.
  • 16″ Chrome-Moly Barrel with A2 Flash Hider – Why it matters: Chrome-moly steel resists heat and wear, and the A2 flash hider reduces muzzle signature. This barrel is threaded 5/8×24, making it suppressor-ready out of the box.
  • R4 Handguard with Full-Length Picatinny Top – Why it matters: The free-float R4 handguard provides a rigid mounting surface for lights, lasers, and vertical grips, and the railed gas block gives you a fixed front sight base or additional rail space.
  • Overmolded A2 Grip – Why it matters: The rubber overmold on the A2 profile adds a positive, non-slip texture even with wet or gloved hands, without changing the classic grip angle you’re used to.
  • Tactical Carbine Stock – Why it matters: This six-position collapsible stock lets you adjust length of pull for different body sizes or heavy clothing, and it locks up tight with no wobble.

Who It’s For

This rifle is built for the shooter who wants a .300 Blackout carbine that’s ready to hunt subsonic loads or defensive rounds without a ton of aftermarket tinkering. It suits the traditionalist who values a two-stage trigger, a railed gas block, and a stock that just works. If you’re looking for a reliable, mid-weight AR that’s set up for optics and a suppressor, this is a strong candidate.

Pros & Cons

  • Pro: Factory two-stage match trigger is a $150+ upgrade included at no extra cost.
  • Pro: Railed gas block gives you a fixed front sight base and extra rail space for a backup sight or laser.
  • Pro: The 1:8 twist barrel stabilizes both 110-grain supersonic and 220-grain subsonic loads well.
  • Con: The R4 handguard is aluminum and can get warm after sustained fire; you’ll want rail covers or gloves for extended shooting sessions.

Comparison

Feature Rock River Arms BLK1850 Geissele Super Duty 300 BLK Palmetto State Armory PA-15 300 BLK
Trigger Two-stage match (4.5 lb) Geissele SSA-E (3.5 lb) Mil-spec single-stage (7 lb)
Barrel 16″ chrome-moly, 1:8 twist 16″ chrome-moly, 1:7 twist 16″ nitrided, 1:7 twist
Handguard R4 free-float, full picatinny top Geissele MK16 MLOK PSA 15″ MLOK
Gas Block Railed low-profile Low-profile pinned Low-profile
Stock RRA Tactical CAR (6-position) Geissele Super 42 buffer + B5 SOPMOD Magpul MOE SL
Price $1,015.50 $1,999.00 $699.00

FAQ

What is the twist rate on the Rock River Arms BLK1850 barrel?

The barrel has a 1:8 twist rate, which stabilizes both supersonic and subsonic .300 Blackout loads effectively.

Is this rifle suppressor-ready?

Yes. The 16″ barrel is threaded 5/8×24 and comes with an A2 flash hider that can be removed to mount a direct-thread suppressor or QD adapter.

Does the railed gas block accept standard AR-15 front sights?

Yes. The gas block has a Picatinny rail section that accepts any standard flip-up or fixed front sight with a Picatinny clamp.

What magazines does this rifle use?

It uses standard AR-15 .300 Blackout magazines (30-round capacity included). Note: .300 BLK magazines are marked differently than 5.56 mags to prevent cross-loading.

Is the two-stage match trigger adjustable?

No, it’s a fixed two-stage trigger set at 4.5 pounds from the factory. It is not user-adjustable, but it is crisp and consistent.

✓ Nationwide delivery (all 50 states)
✓ Ships 1-2 business days
✓ 30-day returns
✓ Secure checkout

Last updated: April 2026

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