OMEGA ARMS Gideon Shadow UPM

Seller Description For This Firearm

Omega Arms Gideon Shadow UPM .45 ACP Pistol – Unmatched Versatility, Legendary UMP Heritage

Omega Arms Gideon Shadow UPM, .45 Auto, 8" Barrel – Includes Two 25-Round Magazines

If you've been hunting for a pistol that blends iconic HK UMP DNA with modern semi-auto reliability, the Omega Arms Gideon Shadow UPM in .45 Auto is the platform you've been waiting for. Rugged, versatile, and built for shooters who want a genuinely fun, high-capacity range companion, this pistol delivers heritage-inspired performance without the heritage-sized price tag.

A Modern Take on a Battle-Proven Icon

The Gideon Shadow UPM is a semi-automatic pistol built around the legendary HK UMP/USC platform, giving you the look, feel, and heft of a submachine gun icon in a fully compliant, range-ready package. This is a recoil-operated, closed-bolt, lightweight, durable, and easy-to-maintain semi-auto pistol designed to perform reliably shot after shot, mag after mag.
Atlantic Firearms

At the heart of this build is an extended 8" barrel, giving you improved velocity, a longer sight radius, and a more commanding presence than the standard-length models — perfect for range days, competitive shooting, or simply owning one of the most distinctive pistols on the market today.

Built Tough, Built Smart

The receiver is made of high-grade glass-filled nylon, giving it exceptional strength while also providing toughness that helps resist fractures and breaks if dropped. Despite its rock-solid construction, this pistol stays impressively lightweight — it comes in at about 5 pounds unloaded, making it easy to handle, maneuver, and shoot comfortably during extended range sessions.
Atlantic Firearms + 2

Function is just as thoughtful as form. The design features a last-round hold-open device that locks the bolt open once the magazine runs empty, so you always know your status at a glance. Reloads are refreshingly simple — insert a fresh magazine and a quick jab of the thumb closes the bolt and chambers a live round, keeping you in the fight or on the clock with zero wasted motion.
Atlantic Firearms
Atlantic Firearms

Best of all, there's no gunsmithing required and no special tools needed for assembly or disassembly — this is a pistol built for shooters, not machinists. The quick-change barrel pin system allows the entire weapon to be broken down to the bare receiver in seconds, making cleaning and maintenance refreshingly painless.
Atlantic Firearms
HKPRO

Chambered for Power, Built for Capacity

This Gideon Shadow UPM is chambered in the time-tested .45 Auto, a caliber respected for generations for its stopping power and controllable recoil in blowback platforms like this one. The .45 ACP variant delivers accurate performance at 935 feet per second within an effective range of 65 meters, giving you plenty of authority for target work, steel challenges, or recreational shooting.
Omega Guns

This package doesn't leave you searching for feeding options either — it ships with two 25-round magazines, giving you serious capacity right out of the box so you can spend more time shooting and less time reloading. Whether you're running drills, plinking with friends, or just enjoying a day at the range, you'll have the ammo capacity to keep the fun going.

For shooters looking to run a suppressor, this pistol is ready to go. The barrel comes tri-lugged and threaded for suppressor use, so adding a can to your setup is simple and doesn't require any additional gunsmithing.
Omega Guns

Why Shooters Love the Gideon Shadow Platform

✔ 8" barrel for enhanced velocity and an extended sight radius
✔ Two included 25-round magazines for extended range sessions
✔ Durable glass-filled nylon receiver — tough, lightweight, and drop-resistant
✔ Tri-lug threaded barrel — suppressor-ready right out of the box
✔ Last-round hold-open for fast, intuitive reloads
✔ Tool-free disassembly for hassle-free cleaning and maintenance
✔ Iconic UMP-inspired design — a true head-turner at the range
✔ Chambered in .45 Auto — proven stopping power, manageable recoil

Own an Icon, Built for Today

The Gideon Shadow UPM isn't just a pistol — it's a conversation starter, a range-day favorite, and a nod to one of the most respected submachine gun platforms ever fielded. With its rugged build, generous magazine capacity, and unmistakable UMP-style silhouette, this pistol offers exceptional value for shooters who want performance and personality in one package.

Pistols like this don't stick around long — the combination of extended barrel length, dual high-capacity magazines, and unmistakable heritage design make the Gideon Shadow UPM a standout addition to any collection. Add it to your cart today and experience a piece of firearms history reimagined for the modern shooter.

UPC	ECOM00600751
Action	SEMI AUTOMATIC
Barrel Length	8.00" BARREL
Caliber	.45 ACP
Capacity	25 ROUNDS
Finish	BLACK

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