The Armalite M-15 Competition AR-15 rifle in .223 Wylde/5.56 NATO is built for shooters who demand precision and speed on the range. This 18-inch competition carbine combines a lightweight platform with match-grade components designed to deliver tight groups and reliable performance in timed and tactical disciplines. At 7.8 lbs, it's nimble enough to handle rapid target transitions without sacrificing the inherent stability you need when accuracy counts.

The heart of this rifle is a free-floating stainless steel barrel paired with an Armalite tunable muzzle brake—gear that lets you dial in performance to match your ammunition and shooting style. The adjustable gas block takes personalization further, letting you tune the rifle's cycling to run smoothly with the loads you're running. A low-profile handguard keeps the setup sleek and manageable, while the Timney single-stage trigger breaks at a crisp 3 pounds, giving you the predictability competitive shooters depend on.

The receiver is machined aluminum with a hard-coat black finish, paired with an MBA-1 adjustable stock that lets you dial in length of pull and comb height for your natural shooting position. This level of fit matters when you're stacking shots—the more the rifle fits your body, the faster you return to target. The rifle ships with one 30-round Magpul PMAG, ready to load and run. Whether you're new to competition or sharpening your skills at a local 3-gun match or precision rifle event, the M153GN18 gives you a platform built to win.

Key Features

• Free-floating 18-inch stainless steel barrel with 1:8 twist for reliable 5.56 NATO and .223 Wylde ammunition
• Armalite tunable muzzle brake allows shooter to optimize recoil impulse and performance
• Adjustable gas block for individual rifle tuning and reliability across varying loads
• Timney 3-pound single-stage trigger for quick, predictable break
• MBA-1 adjustable stock with variable length of pull and comb height
• Low-profile handguard for compact, ergonomic handling
• Lightweight at 7.8 lbs for fast target transitions
• Includes one 30-round Magpul PMAG

Specifications

Caliber	.223 Wylde / 5.56 NATO
Action	Semi-Auto
Barrel Length	18 inches
Barrel Material	Stainless Steel
Barrel Twist	1:8
Muzzle Device	Armalite Tunable Brake
Gas System	Adjustable Gas Block
Magazine Capacity	30 rounds
Upper Receiver	Aluminum, Black
Lower Receiver	Aluminum, Black
Stock	MBA-1 Adjustable Length-of-Pull & Comb, Black
Trigger	Timney Single-Stage, 3 lb
Overall Length	39.5–40.5 inches (varies with stock adjustment)
Weight	7.8 lbs
Included Magazine	(1) 30-round Magpul PMAG

Frequently Asked Questions

What ammunition does the Armalite M-15 Competition shoot?

The M153GN18 is chambered in .223 Wylde/5.56 NATO. This dual-chamber design safely fires both .223 Remington and 5.56 NATO ammunition, giving you flexibility in what you run through it.

Can I adjust this rifle to work with different ammunition or loading?

Yes. The adjustable gas block allows you to tune the rifle's performance to your specific ammunition, which helps optimize reliability and felt recoil whether you're shooting lighter or heavier loads.

What comes in the box?

The rifle ships with one 30-round Magpul PMAG magazine, ready to load and shoot.

Is the M-15 Competition good for 3-gun or precision rifle competition?

The free-floating barrel, Timney trigger, adjustable stock, and tunable muzzle brake are all features built for competitive shooting. The lightweight design and fast-handling 18-inch barrel make it well-suited to timed and tactical disciplines where speed and accuracy matter.