Description
The Alpha Foxtrot Romulus 4.25 threaded is the middle child of the Romulus family and the one that suits the widest range of shooters. It carries 20+1 rounds of 9mm in a double-stack 1911 frame, wears a threaded bull barrel behind a knurled protector, and comes optic ready with adapter plates in the box. Frame and slide are SUS416 stainless steel under a satin DLC black finish.
Threaded Bull Barrel in a Carry-Friendly Length
4.25-inch bull barrel threaded 1/2×28, the common pitch for 9mm muzzle devices, with a knurled thread protector installed.
Nothing about the Alpha Foxtrot Romulus 4.25 threaded build gives up sight radius to the threads, because the muzzle extends past the slide rather than shortening the barrel.
SUS416 stainless frame and slide in satin DLC black, a hard low-friction coating that resists rust and cleans up with a patch.
Serrated slide and frame, extended beavertail and a Picatinny rail on the dust cover.
Optic Ready With Plates Included
MOS adapter system covers both the Trijicon RMR and the Shield RMSc footprints, so most compact and full-size red dots fit.
Three-dot glowing night sights are fitted at the factory and stay usable under most optics.
Textured injected polymer grip module keeps weight down to roughly 2.2 pounds.
Ships with 17-round and 20-round double-stack magazines.
Part number AA39X1CIB-XDBK19.
Alpha Foxtrot Romulus 4.25 Threaded Specifications
- Caliber: 9mm Luger
- Capacity: 20+1 with the supplied 20-round magazine
- Barrel: 4.25 inch bull, threaded 1/2×28, thread protector installed
- Frame and slide: SUS416 stainless steel, satin DLC black
- Optic cut: MOS adapter system, RMR and RMSc footprints supported
- Sights: three-dot night sights
- Grip: textured injected polymer grip module
- Features: extended beavertail, Picatinny accessory rail, serrated slide and frame
- Weight: approximately 2.2 pounds
- Magazines: 17-round and 20-round
- Part number: AA39X1CIB-XDBK19
- UPC: 810100535650
Threads are worth having even if a muzzle device is not in the budget yet. They let you add a compensator later without sending the barrel out, and they make the gun a candidate for a suppressor host down the road. Note that MAG5 Firearms does not sell NFA items, so a suppressor has to be sourced separately and cleared through ATF approval before it can be mounted. Until then the thread protector stays on and the pistol handles exactly like a plain-muzzle Romulus.
Why it is worth considering
- 20+1 capacity in a 1911 trigger geometry.
- Threaded from the factory, so a comp or other muzzle device bolts straight on.
- Adapter plates for two optic footprints included rather than sold separately.
- Night sights fitted at the factory.
- SUS416 stainless with a DLC black finish, built in America.
Who it suits
Shooters who want one double-stack 1911 that covers carry, range days and the occasional match will get the most out of the Alpha Foxtrot Romulus 4.25 threaded. It is also the sensible pick for anyone who expects to add a compensator or, eventually, a suppressor, since the threads are already cut and the optic plates are already in the box.
Choosing a Length in the Romulus Family
Alpha Foxtrot builds the Romulus in 3.5-inch, 4.25-inch and 5-inch lengths, with standard, threaded or compensated barrels and with a polymer or a machined aluminum grip module. If a factory compensator sounds better than bare threads, compare the 4.25-inch compensated model. Want a longer sight radius? See the 5-inch threaded build or the 5-inch polished standard barrel. Model details are published by the maker at Alpha Foxtrot.
A 20+1 9mm pistol eats ammunition quickly, so it pays to keep both a practice load and a carry load on the shelf. A 124-grain jacketed hollow point is a sound defensive choice, with 115-grain full metal jacket for volume work at the range. All firearm orders ship to a licensed FFL dealer for transfer, and MAG5 Firearms will coordinate the paperwork with the dealer of your choice.
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