Standard Manufacturing120921831
Standard MFG SKO Shorty 18" Semi-Auto 12ga Shotgun Black - SKOSBLK$812.50
Availability: In Stock
Current Stock: Out of stock
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.
| Gauge | 12 Gauge |
| Chamber | 3\" (accepts 2¾\" or 3\" ammunition) |
| Barrel Length | 18.5\" |
| Barrel Material | 4140 Steel, threaded for chokes |
| Magazine Capacity | 5 rounds detachable |
| Action Type | Semi-automatic gas-operated |
| Upper Receiver | Machined from solid billet 7075 aircraft-grade aluminum |
| Lower Receiver | Machined from forged 7075 aircraft-grade aluminum |
| Finish | Mil-spec hard coat anodized upper/lower, salt bath nitride internal components, matte black |
| Picatinny Rail | Full-length 22 rail on upper receiver |
| Stock | 6-position adjustable |
| Grip | AR-style pistol grip |
| Overall Length (Extended) | 38\" |
| Weight (Without Magazine) | 7 lbs 10 oz |
Yes. The SKO-12's 3\" chamber accepts both 2¾\" and 3\" ammunition, so you can shoot either without changing any components.
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.
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.
The barrel is threaded to accept chokes, giving you the flexibility to match your shot pattern to your intended use.
SKU: 120915733 • Width: 12.2in • Height: 4.2in • Depth: 39in • Weight: 8oz
Availability: In Stock
Current Stock: Out of stock
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.
| Gauge | 12 Gauge |
| Chamber | 3\" (accepts 2¾\" or 3\" ammunition) |
| Barrel Length | 18.5\" |
| Barrel Material | 4140 Steel, threaded for chokes |
| Magazine Capacity | 5 rounds detachable |
| Action Type | Semi-automatic gas-operated |
| Upper Receiver | Machined from solid billet 7075 aircraft-grade aluminum |
| Lower Receiver | Machined from forged 7075 aircraft-grade aluminum |
| Finish | Mil-spec hard coat anodized upper/lower, salt bath nitride internal components, matte black |
| Picatinny Rail | Full-length 22 rail on upper receiver |
| Stock | 6-position adjustable |
| Grip | AR-style pistol grip |
| Overall Length (Extended) | 38\" |
| Weight (Without Magazine) | 7 lbs 10 oz |
Yes. The SKO-12's 3\" chamber accepts both 2¾\" and 3\" ammunition, so you can shoot either without changing any components.
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.
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.
The barrel is threaded to accept chokes, giving you the flexibility to match your shot pattern to your intended use.
SKU: 120915733 • Width: 12.2in • Height: 4.2in • Depth: 39in • Weight: 8oz