Standard Manufacturing SKO-12 | 12ga | 18.5″ Barrel

The Standard Manufacturing SKO-12 is a semi-automatic 12-gauge shotgun built with AR-style ergonomics and a detachable magazine for faster reloads. It uses a gas-operated system and a 3-chamber design that accepts either 2-3/4″ or 3″ shells. The firearm pairs a threaded 18.5″ 4140 steel barrel with billet and forged 7075 aluminum receivers finished in a matte black hard-coat anodize. The SKO-12 is configured for optics and accessory mounting and features a 6-position adjustable synthetic stock with a pistol grip.

Product Specifications

• The model is SKO-12.
• The manufacturer is Standard Manufacturing.
• The gauge is 12 Gauge.
• The action type is Semi-Auto.
• The chamber accepts 2-3/4″ or 3″ shells (3-chamber).
• The barrel measures 18.5 inches and is made from 4140 steel.
• The barrel is threaded to accept chokes.
• The magazine capacity is 5 rounds via a detachable magazine.
• The operating system is a gas-operated design intended for smooth cycling.
• The stock is a 6-position adjustable synthetic stock with pistol grip.
• The grip material is polymer.
• The upper receiver is machined from solid billet 7075 aircraft-grade aluminum.
• The lower receiver is machined from a 7075 aircraft-grade aluminum forging.
• Internal components feature a salt bath nitride finish.
• The product UPC is 866281000388.

The SKO-12 is aimed at shooters who want an AR-style control layout and modularity in a 12-gauge semi-automatic platform. Its threaded barrel and roomy rail system make it straightforward to fit optics, lights or other accessories, while the detachable magazine and adjustable stock support rapid reloads and user-specific length-of-pull adjustments. Built with 7075 receivers and hardened internal finishes, it emphasizes durability and serviceability.

Owners commonly praise the SKO-12 for its smooth, reliable gas system and the convenience of its interchangeable detachable magazine system.