Standard Manufacturing SKO-12 12 Gauge Semi-Auto Shotgun, 18.5 in, Magazine-Fed, Two-Tone (Black with Gray/Bronze Barrel)
The Standard Manufacturing SKO-12 is a U.S.-made, magazine-fed, gas-operated 12-gauge with an 18.5 in barrel and a two-tone finish featuring a black receiver/forend/furniture and a contrasting gray/bronze-toned barrel/outer tube. It features a continuous top Picatinny rail, a telescoping stock with adjustable length of pull, and user-friendly controls including an ambidextrous safety and a right-side charging handle. Chambered for both 2.75 in and 3 in shells and built around a detachable 5-round box magazine, it offers a modern, AR-style layout introduced in the mid-2010s.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Specific Condition Notes: This firearm presents in great shape with a few minor exterior scratches and blemishes. The bore shows a bright, mirror-like finish consistent with excellent care.
What’s Included
- 1x 5-round detachable steel box magazine
- Factory SKO choke wrench
- Standard Manufacturing SKO-12 owner's manual
- Gun lock
- No box included
The SKO-12 is a gas-operated, semi-automatic 12-gauge built around a detachable 5-round box magazine, giving it a familiar, AR-style manual of arms. Its 3 in chamber accepts both 2.75 in and 3 in shells, delivering flexibility across common 12-gauge loads.
An 18.5 in barrel uses a screw-in internal choke system, and the ventilated polymer forend aids handling while keeping weight down. A continuous 12-o'clock Picatinny rail runs along the top, and the two-tone finish provides a low-glare appearance.
Controls and ergonomics are modern and straightforward: a right-side charging handle for easy manipulation, an ambidextrous safety, and a telescoping stock with adjustable length of pull. The polymer pistol grip with finger grooves supports a secure, consistent hold.
Made in the United States, the SKO-12 measures about 36.5 in overall and has a factory weight of about 6.5 lb. The design was introduced in the mid-2010s, bringing a magazine-fed approach to the 12-gauge semi-auto platform.