Standard Mfg SKO-12 AR 12ga Auto Shotgun - SKO12

The Standard Mfg SKO-12 AR 12 gauge semi-auto shotgun brings AR-platform ergonomics and modularity to the shotgun world. Built on a billet aluminum upper and forged aluminum lower receiver—both finished with mil-spec hard coat anodizing—the SKO-12 delivers the familiarity of AR controls with the stopping power of a 12 gauge. This is a serious choice for tactical shooters, home defense, and sport shooting who want the customization and speed of an modern rifle platform in shotgun form.

The SKO-12 runs a gas-operated system designed for smooth, reliable cycling across both 2¾" and 3" ammunition. Its 18.5" steel barrel is threaded to accept aftermarket chokes, giving you flexibility to dial in patterns for different roles—tighter for distance, looser for close quarters. A 5-round detachable magazine keeps you feeding ammunition fast, and the adjustable stock lets you dial in your preferred length of pull whether you're running it in tactical kit or at the range.

Accessory mounting is a strength here. A full-length Picatinny rail on the upper receiver accommodates optics, lasers, and other sighting systems, while a rail point on the fore grip accepts additional Magpul MOE rails for lights, foregrips, or whatever your setup demands. The SKO-12 uses familiar AR-style controls—pistol grip, safety selector, magazine release—so if you already run AR rifles, the manual of arms is second nature. Internal components wear a salt bath nitride finish for corrosion resistance in field use.

At just over 7.5 pounds unloaded and 38 inches extended, the SKO-12 balances firepower with manageability. Whether you're setting up a home defense platform, building a competition gun, or exploring what modern shotgun design can do, the SKO-12's blend of reliability, modularity, and AR-familiar handling makes it worth serious consideration.

Key Features

• Semi-automatic gas-operated action for smooth, reliable cycling
• Accepts both 2¾\" and 3\" ammunition
• Threaded 18.5\" barrel for aftermarket choke compatibility
• Billet 7075 aircraft-grade aluminum upper receiver with mil-spec hard coat anodize
• Forged 7075 aluminum lower receiver with mil-spec hard coat anodize
• Full-length Picatinny rail for optics, lasers, and tactical accessories
• Fore grip rail point for Magpul MOE rail attachments
• AR-style ergonomics: pistol grip, safety selector, and magazine release
• 5-round detachable magazine
• 6-position adjustable stock
• Salt bath nitride finish on internal components for corrosion resistance

Specifications

Frequently Asked Questions

Can the SKO-12 shoot both 2¾\" and 3\" shells?

Yes. The SKO-12's 3\" chamber accepts both 2¾\" and 3\" ammunition, so you can shoot either without changing any components.

What optics and accessories can I mount on the SKO-12?

The full-length Picatinny rail on the upper receiver accommodates any standard rifle optics, red dots, lasers, and tactical lights. The fore grip also has a rail mounting point for Magpul MOE rail attachments to add lights, vertical grips, or other accessories.

Are the controls the same as an AR rifle?

Yes. The SKO-12 uses AR-style controls including the pistol grip, safety selector, and magazine release, so shooters familiar with AR platforms will find the manual of arms intuitive.

Can I use aftermarket chokes with the SKO-12?

The barrel is threaded to accept chokes, giving you the flexibility to match your shot pattern to your intended use.