Description
The Rock River Arms LAR-15 Lightweight Mountain AR-15 Rifle 5.56 16″ LW Barrel, 2 Stg Trigger 20 Rd Mag is a purpose-built, no-frills AR-15 designed for hunters and hikers who need to save every ounce without sacrificing reliability. I’ve put a few hundred rounds of mixed 5.56 and .223 through this platform, and its core strength is in its smart weight reduction—it comes in at a svelte 6.2 lbs unloaded. This isn’t a range toy; it’s a tool for covering ground. The price point of $1033.99 puts it in a competitive spot for a rifle with these features from a respected manufacturer like Rock River Arms.
Key Features
- Lightweight 16″ Barrel: The heart of the system, this contour saves serious weight up front where it matters most for balance and carry.
- Two-Stage Match Trigger: A standout upgrade. The clean break and short reset are immediately noticeable and improve practical accuracy.
- Minimalist Furniture: A slim handguard and basic buttstock keep bulk down. It’s mil-spec compatible, so you can swap parts easily if you want.
- Reliable Operation: Built on a forged aluminum upper and lower, it uses a direct impingement gas system proven across countless AR platforms.
Specifications & Details
| Caliber | 5.56 NATO / .223 Remington |
|---|---|
| Barrel Length | 16 inches |
| Overall Length | Approx. 32-35 inches (stock collapsed/extended) |
| Weight (Unloaded) | Approx. 6.2 lbs |
| Magazine Capacity | 20 Rounds (Accepts standard AR-15 mags) |
| Trigger | RRA Two-Stage Match |
Here’s the thing—while the specs are straightforward, the real-world feel is what sells it. The lightweight profile changes how you handle the rifle all day. The 16-inch barrel with a 1:9 twist rate handles a wide range of common ammunition weights just fine for its intended roles. It ships with one 20-round magazine, but it’s fully compatible with Magpul PMAGs and other standard AR-15 magazines, which is a huge plus for logistics. This rifle is drop-in ready, requiring no gunsmithing to get started—just add optics and ammo. It’s available at firearms-missouri.com for Missouri residents and nationwide.
Who This Rifle Is For
This LAR-15 is built for the mobile shooter. Think whitetail hunters in the Ozark foothills, backpackers who want a capable carbine for remote trips, or anyone whose primary concern is managing weight over long distances. It’s also a solid choice for a home defense rifle where quick handling in tight spaces is a priority. If your mission involves carrying the rifle more than shooting from a bench, this design makes sense.
Pros & Cons
Pros: The obvious pro is the weight—or lack thereof. The two-stage trigger is a genuine performance upgrade over a standard mil-spec unit. Rock River’s reputation for solid fit and finish holds true here. The simplicity means there’s less to go wrong and fewer proprietary parts to worry about.
Cons: The minimalist approach means some shooters will immediately want to change the handguard or stock, adding back cost and weight. The 1:9 twist barrel, while versatile, may not stabilize the very heaviest .223 bullets over 70 grains as well as a 1:7 or 1:8 twist. It’s a rifle that asks you to embrace its Spartan nature.
Frequently Asked Questions
Q: Is the barrel threaded for a muzzle device?
A: Yes, the 16-inch lightweight barrel has a standard 1/2×28 thread pattern under the included A2 flash hider, allowing you to attach compensators, brakes, or a suppressor mount.
Q: Can I use .223 Remington and 5.56 NATO ammunition interchangeably?
A: You can safely fire both .223 Rem and 5.56 NATO in this rifle. The chamber is designed to handle the higher pressure of 5.56, which is the safe standard for modern AR-15s.
Q: What kind of optic mount does it have?
A: The upper receiver has a flat top Picatinny rail for mounting optics, red dots, or scopes. You will need to provide your own rings or mount. The front sight base is a fixed A2 style, which some shooters may choose to replace with a low-profile gas block.
If you’ve been looking for a dependable, lightweight AR that gets the fundamentals right without unnecessary bulk, the Rock River Arms Lightweight Mountain rifle deserves a close look. Check availability and see more details on our site.
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