If you grew up playing video games in the late ’90s or early 2000s, you probably have some weird tastes in guns. If you played Half-Life, there is one gun in particular you might wish you could own, you know the exact gun I’m talking about—the MP5 with the underbarrel grenade launcher. It was iconic. It was cool. And for some of us, it was the start of a lifelong obsession with guns and gear.
The problem? In real life, there’s never been a simple, purpose-built way to mount a launcher to an MP5. Until now.
Onward Research Freeman MP5 Rail
This rail isn’t just another piece of aluminum with slots and screws—it’s built from the ground up to do exactly what every Half-Life fan and MP5 owner secretly wanted: give your gun full, solid support for a 37mm or 40mm launcher. No wobble, no half-contact mounts, no “close enough” fit. This thing mates directly to the receiver, locks down tight, and can actually take the recoil and weight of a launcher without damaging your gun.
For civilians, that means you can legally run a 37mm flare launcher (fun, legal, and still ridiculously satisfying). For military or authorized users, it’ll handle a 40mm like the LMT M203 shorty without breaking a sweat.
Why It Works
Most MP5 rails were never designed with launchers in mind—they’re for lights, grips, and optics. The Freeman Rail extends past the muzzle for full launcher support, uses M-LOK for flexibility, and even has venting and porting to help keep the gun flat under fire. Between the MP5’s roller-delayed system, the extra weight out front, and the clever design of the handguard, recoil on an MP5 is basically nonexistent.
It also fits a wide range of MP5s and clones (PTR, Zenith, Dakota Tactical, HK SP5, etc.) thanks to adjustable mounting points. No “close enough” fit here—it’s meant to lock up solid.
Range Time & Purpose
Watching the test runs in the video says it all—double taps, bursts, full mags—the muzzle barely moves. Add in a force reset trigger, and you’ve basically got a laser beam of 9mm joy. Then there’s the launcher. Whether it’s a 37mm or 40mm, both options make the whole setup look and feel like you pulled it straight out of a video game.
This isn’t just about cosplay or nostalgia. A rail like this opens up real utility for the MP5 and allows the end user to increase the capability of their platform.
Plus, let’s be honest—there’s something about the profile of an MP5 with a grenade launcher that’s just cool.
Live Inventory Price Checker
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9ct Pistol - Ptr 9ct 9mm Roller Locking Blk Threaded | Brownells.com | $ 1899.99 |
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PTR 9CT 9mm Pistol 8.86" Barrel M-LOK Tungsten Finish with Foldable Brace | Bereli | $ 1899.00 |
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PTR 9CT 9mm 8.86" Threaded Barrel M-LOK Pistol - PTR 601 | Palmetto State Armory | $ 1960.99 $ 1765.99 |
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PTR 9CT BR 9mm 8.86" 30+1 AR-Pistol (Black) | Ammunition Depot | $ 1767.99 |
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Final Thoughts
This was a passion project years in the making, built by guys who actually shoot, train, and obsess over the details. It’s not cheap to make, and it’s not for safe queens—it’s for people who want to run their gear and smile doing it.
Whether you’re a Half-Life fan reliving your glory days or just an MP5 owner looking for the ultimate flex at the range, the Freeman Rail delivers. Sometimes, you just have to build the thing you always wanted as a kid.
POF 5PK MP5 – The Budget Reverse-Stretch Semi Auto from Pakistan
Meh, just use the M79 with buckshot or fléchette round when clearing a room.
What is the most impressive in the video is how well the FRT works.
sweet, must have before the upcoming war!