ArmaLite M153GN18 | 18″ Barrel | Timney Trigger

The ArmaLite M153GN18 is a competition-oriented modern sporting rifle built around an 18-inch stainless steel barrel and a lightweight, adjustable MBA-1 stock for fast, repeatable handling. It is configured with a free-floating 15″ 3-gun handguard, a Timney single-stage trigger, and an ArmaLite tunable muzzle brake to support rapid follow-up shots in competition. A good optic choice under $1,000 for this platform is the Vortex Viper PST Gen II 1-6×24, which balances fast target acquisition with low-light capability.

Common applications: 3-Gun competition and practical/action shooting matches, where a compact, light, and quick-handling rifle is preferred.

Product Specifications

• The barrel measures 18 inches for competition-oriented handling.
• The barrel material is stainless steel.
• The barrel twist rate is 1:8″.
• The muzzle device is an ArmaLite tunable brake.
• The lower receiver is forged 7075-T6 aluminum.
• The upper is a forged flat top with MIL-STD 1913 rail for optics mounting.
• The handguard is a free-floating 15-inch 3-gun style rail.
• The stock is an adjustable Luth-AR MBA-1 for length-of-pull and comb height.
• The trigger is a Timney single-stage (listed as 3 lb.).
• The charging handle is a Raptor ambidextrous.
• The action is semi-automatic.
• The overall length is 40.5 inches.
• The weight is 7.8 pounds.
• The finish is black hard-coat anodized receiver with stainless barrel.
• The UPC is 651984015247.

This configuration emphasizes competition performance: a free-floating handguard and tunable brake combine with an adjustable MBA-1 stock and a crisp Timney trigger to support fast transitions and consistent shot placement. The package is optimized for athletes who need a light, quick-handling rifle with aftermarket-friendly interfaces and a robust parts set for competition tuning.

Owners and product descriptions commonly note its competition-focused balance and light, ultra-fast handling, as well as praise for the Timney trigger and adjustable MBA-1 stock.

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