The Rock River LAR-15 CAR A4 is a semi-automatic rifle chambered in 5.56x45mm NATO with a 16-inch chrome moly barrel at a 1:9 twist rate. Weight is 7.1 lbs with a black finish. Capacity is 30+1. The lower is a forged RRA LAR-15 paired with a forged A4 upper. The trigger is a two-stage unit and the safety is lever-type. The stock is an RRA six-position tactical car stock. 
 

Key Specifications 

• Model: LAR-15 CAR A4 
• Caliber: 5.56x45mm NATO 
• Action: Semi-Automatic 
• Barrel Length: 16 inches 
• Weight: 7.1 lbs. 
• Finish: Black 
• Capacity: 30+1 rounds 
• Safety: Lever Safety 
• Trigger Type: Two-stage Trigger 
• Grip Type: Standard Grip (A2) 
• Stock Type: RRA 6-position Tactical Car Stock 
   

Detailed Features 

The 16-inch chrome moly barrel with a 1:9 twist stabilizes standard 5.56 NATO loads well and is advertised to achieve 1 MOA at 100 yards. The forged upper and lower are RRA's own forgings. The two-stage trigger is a meaningful upgrade over mil-spec single-stage triggers and gives a cleaner break. The six-position collapsible stock lets you dial in length of pull for different shooting positions or body armor setups. The A2 grip is standard but swaps out easily given the AR platform's widespread parts ecosystem. 
 

Usage 

At 7.1 lbs the CAR A4 sits in the mid-range for AR-15s — lighter than many similarly-featured rifles but not the lightest option available. The two-stage trigger and 1:9 twist make it a reasonable choice for the range or competitive use. The AR platform means parts and accessories are widely available if you want to modify the build later.

Owners of the Rock River LAR-15 Tactical in 5.56 NATO generally speak positively about reliability — the rifle runs consistently across varied conditions and ammo without fussing. Accuracy gets mentioned often, usually in the context of the two-stage trigger making groups tighter than comparable single-stage setups at the same price.

Build quality is a recurring positive point. The forged receivers feel solid and users report the rifle holding up well over time. The AR-15 platform compatibility is seen as an advantage since aftermarket parts are easy to source.

Criticism centers on weight — at 7.1 lbs some shooters find it heavier than they'd want for extended carry. Price versus value comes up in comparison threads; some feel comparable-performing ARs can be found for less, though RRA quality is generally conceded. A few buyers report minor challenges aligning optics initially. Aftermarket part availability specific to RRA's proprietary components (as opposed to standard mil-spec parts) is occasionally flagged as a minor limitation.