Step up to a rifle built for precision-minded AR shooters who still want practical, real-world capability: the Rock River Arms LAR-15M NM A4 chambered in .223 Wylde. Purpose-built with a competition-influenced foundation and a feature set that supports consistent accuracy, this rifle pairs a 20-inch threaded heavy barrel with an A2 flash hider, a proven A4-style setup, and Rock River Arms’ reputation for tight fit and refined performance. Add in a 20+1 capacity potential, an included 20-round magazine, and a carrying case, and you have a complete, range-ready package that’s ideal for shooters who want a quality AR that performs beyond basic carbine standards.
If you’re searching for a Rock River Arms LAR-15M NM A4 223 Wylde, a 20-inch heavy barrel AR-15, or an A4-style precision AR, the AR1289 (UPC 842834100507) is an excellent choice for target work, training, and any application where stability and accuracy matter.
Rock River Arms LAR-15M NM A4: Accuracy-Driven AR Performance
The “NM” designation is often associated with rifles built with accuracy and consistency in mind, and the LAR-15M NM A4 reflects that approach in its barrel profile, length, and overall configuration. Rock River Arms rifles are widely appreciated for their refined build feel—tight receiver fit, smooth operation, and components selected to support repeatable shooting.
This model’s A4-style format offers a classic, proven layout that many shooters prefer for its longer barrel, stable handling, and familiarity. It’s a configuration that feels balanced when shooting from prone, bench, or supported positions—especially helpful when your goal is small groups and consistent hits.
.223 Wylde Chamber: Versatility Meets Precision
Chambered in .223 Wylde, this rifle is designed to bridge the gap between the common .223 Remington and 5.56 NATO worlds, offering a versatile platform for a wide variety of ammunition types. For many shooters, .223 Wylde is a go-to choice because it’s often selected for accuracy-oriented AR builds while maintaining broad ammo compatibility.
Whether you’re shooting for tight groups at distance, training with widely available ammo, or dialing in a load your rifle “likes,” the .223 Wylde chamber is a practical choice that supports both performance and flexibility.
20" Threaded Heavy Barrel: Stability, Consistency, and Downrange Confidence
At the heart of this LAR-15M NM A4 is a 20-inch heavy barrel, a key feature for shooters who want added stability and consistent performance over strings of fire. A heavy barrel profile can help reduce barrel whip and improve heat management during longer shooting sessions, which can support more consistent point of impact when you’re working drills or shooting multiple groups in one outing.
The 20-inch length is also a classic choice for those who want the traditional full-length AR feel and strong downrange performance. Many shooters appreciate how a 20" setup:
Provides a steady, balanced swing and sighting feel
Supports consistent accuracy from supported positions
Delivers a traditional rifle-length handling profile
The barrel is also threaded, giving you flexibility for compatible muzzle devices, and it ships with an A2 flash hider installed—an iconic, functional choice that helps manage flash while maintaining a clean, classic AR aesthetic.
A2 Flash Hider: Classic Function, Proven Design
The included A2 flash hider is a staple on many AR setups for good reason. It’s lightweight, dependable, and maintains the classic look that many shooters prefer—especially on an A4-style rifle. It also keeps the rifle ready out of the box without forcing immediate upgrades.
RRA Operator CAR Stock: Practical Adjustability
This rifle includes the RRA Operator CAR stock, giving you adjustable length-of-pull so the rifle can fit different shooters, different clothing layers, and different shooting positions. Adjustability is particularly useful on a longer 20-inch rifle, allowing you to fine-tune how the rifle shoulders and how your eye aligns with your optic or sights.
A good stock setup supports:
More consistent shoulder placement
Improved comfort over longer sessions
Better control during recoil and follow-through
A2 Pistol Grip: Familiar Ergonomics, Traditional Control
The A2 pistol grip remains one of the most familiar AR grip profiles ever made. It offers a straightforward, classic feel that many shooters find comfortable—especially those who prefer traditional AR ergonomics or want a rifle configured in a proven, no-nonsense style.
20+1 Capacity Potential + Included Magazine and Carrying Case
Configured for 20+1 capacity potential with standard magazines, this rifle is supplied with one 20-round magazine, making it range-ready right out of the case. It also includes a carrying case, an excellent value-add for transport, storage, and keeping your rifle protected between range trips.
Included essentials like this help new owners get up and running faster—without needing to immediately source basic accessories before their first session.
Why Choose the Rock River Arms LAR-15M NM A4 (AR1289)?
If you want a rifle that leans toward accuracy and stability—without losing the practicality of a standard AR platform—this model offers a compelling package. It’s built for shooters who value consistency, a classic A4 layout, and the confidence that comes from a heavier 20-inch barrel configuration.
Top reasons to put it on your short list:
Rock River Arms LAR-15M NM A4 quality and refined build feel
.223 Wylde chambering for versatility and accuracy-oriented performance
20" threaded heavy barrel for stability and consistent shooting
A2 flash hider included for classic function and traditional styling
RRA Operator CAR stock for adjustable fit
A2 pistol grip for familiar handling
Includes 1x 20-round magazine and carrying case for ready-to-go ownership
20+1 capacity potential with standard mags
Ideal Use Cases
The LAR-15M NM A4 is a great fit for:
Precision-focused range shooting and group work
Training with an A4-style rifle-length setup
Shooters who prefer the stability and balance of a 20" heavy barrel AR
Owners looking for a capable AR platform that’s already configured for consistent performance
Anyone who wants a complete package with a magazine and case included
Product Identification
Manufacturer: Rock River Arms
Model: LAR-15M NM A4
Caliber: .223 Wylde
Capacity: 20+1 (with standard magazine)
Barrel: 20" Threaded Heavy Barrel
Muzzle Device: A2 Flash Hider
Stock: RRA Operator CAR Stock
Grip: A2 Pistol Grip
Included: 1x 20-round magazine, carrying case
Model / SKU: AR1289
UPC: 842834100507
For shooters who want an AR that’s built to shoot straight, stay stable, and deliver confident performance at distance, the Rock River Arms LAR-15M NM A4 .223 Wylde is a standout—classic in form, refined in execution, and ready for serious time on the range.
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