ArmaLite AR103GN18 | .308 | 18″ Barrel | 25+1

The ArmaLite AR103GN18 is a purpose-built AR-10 platform configured for practical rifle and 3-Gun competition. It pairs an 18-inch heavy match-grade barrel with an adjustable Luth-AR MBA-1 stock and an ambidextrous control set to suit a range of competitors. For a versatile optic under $1,000 that complements this platform, consider the Vortex Viper PST Gen II 1-6×24 for fast target acquisition and medium-range accuracy. Typical applications include 3-Gun competition and practical precision shooting.

Product Specifications

• The caliber is .308 / 7.62 NATO.
• The action is Semi-Auto.
• The barrel measures 18 inches.
• The barrel is described as heavy match grade.
• The capacity is 25 + 1 rounds.
• The receiver material is 7075-T6 Aluminum.
• The stock is an adjustable Luth-AR MBA-1 with adjustable cheek piece and length-of-pull.
• The safety is ambidextrous.
• The muzzle device is an Armalite tunable brake.
• The trigger is a Timney single-stage.
• The weight is listed as 8.90 lbs.
• The overall length is 40.30″–41.50″.
• The finish is Black hardcoat anodized / black phosphate.
• The rifle includes one 25-round Magpul PMAG.
• UPC: 651984015933.

This AR-10 configuration emphasizes competition ergonomics and tunability: a match-grade barrel and an adjustable stock let the shooter optimize balance and fit, while the Timney single-stage trigger and ambidextrous controls support fast, repeatable operation. The aircraft-grade receiver material and modular rail work with common competition accessories and mounting solutions. Built for practical accuracy and rapid transitions, this rifle is ready for a competitor who wants a highly serviceable platform out of the box.

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