ArmaLite M-15A4 5.56 NATO Semi-Auto Rifle — Early Geneseo Lower, 16" Barrel, OD Furniture
This customized ArmaLite M-15A4 pairs an early Geneseo, Illinois–marked lower receiver with a 16-inch government-profile barrel and rifle-length gas system. Olive-drab furniture and an aftermarket two-port muzzle brake give it a period-correct look with modern shooting comfort. Collectors will appreciate the forged 7075-T6 construction and the clean condition, while shooters gain a versatile 1:9" twist optimized for common 55- to 69-grain 5.56 loads.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent — clean, mirror finish, no signs of wear.
Bore Rifling: Excellent — sharp lands and grooves.
Specific Condition Notes: Minimal handling marks are present, and the bore remains bright and clean.
What’s Included
- ArmaLite M-15A4 rifle with OD green furniture and two-port muzzle brake
- One 30-round USGI-pattern aluminum STANAG magazine
The early Geneseo-marked lower receiver is sought after by ArmaLite enthusiasts, signaling original factory production before the company’s later relocations. Forged from 7075-T6 aluminum and finished in hard-coat anodizing, it delivers the strength and wear resistance expected of a duty-grade AR-15 pattern rifle.
A 16-inch chrome-moly vanadium steel barrel uses a rifle-length gas system—a combination that softens recoil impulse while maintaining reliable cycling. The 1:9" right-hand twist stabilizes a wide range of bullet weights, making this rifle practical for both range use and collection.
Non-factory olive-drab stock, handguards, and A2 pistol grip echo classic ArmaLite offerings while setting this example apart visually. The fixed stock includes a trap-door buttplate for small-parts storage and an integrated rear sling swivel.
The threaded muzzle wears an aftermarket two-port brake that reduces muzzle rise and is compatible with any 1/2x28 TPI accessory. A2 iron sights—front post and detachable carry-handle rear—provide dependable mechanical zero with windage and elevation adjustment.
Overall, this M-15A4 blends collectible provenance, thoughtful custom touches, and practical shooting features in a clean, well-kept package.