Description
The Radian Ramjet Glock 19 Gen 4 Two Tone kit pairs a gray Radianite-coated RAMJET ported barrel with a black AFTERBURNER micro compensator, built specifically for the Glock 19 Gen 4. It is Radian part number R0874, and it drops into the factory slide without gunsmithing, threading, or a longer slide. The result is a flatter-shooting pistol with a two-tone look: the compensator matches a black slide while the gray barrel hood shows through the ejection port.
How the ported barrel and micro comp work together
Most pistol compensators need a threaded barrel and a comp you have to keep tight and timed. This kit skips all of that. The RAMJET barrel has ports cut near the muzzle, and the AFTERBURNER slides over the end of the barrel and locks on with Radian’s INTRA-LOK system: a tapered screw that pulls against a V-groove, so the comp centers itself on the bore every time it is tightened. There are no threads to gall and no crush washers to fiddle with.
When a round fires, gas escapes up through the barrel ports and out the top of the compensator just before the bullet leaves the muzzle. That upward jet pushes the muzzle down against the pistol’s natural flip. On a compact double-stack pistol like the Glock 19 Gen 4, where muzzle rise is what slows follow-up shots, that is exactly where the Radian Ramjet Glock 19 Gen 4 Two Tone earns its place.
Why choose the black and gray finish
Radian offers this kit in all black, bronze, and the black and gray combination on this listing. The Radian Ramjet Glock 19 Gen 4 Two Tone uses a gray Radianite coating on the barrel and black Radianite on the AFTERBURNER. On a black slide the compensator blends in at the muzzle, while the gray Glock 19 Gen 4 barrel hood gives a subtle contrast at the ejection port. It is a quieter look than bronze. Radianite is not paint; it is a hard, low-friction coating that resists corrosion and carbon wear.
Radian Ramjet Glock 19 Gen 4 Two Tone specifications
- Fitment: Glock 19 Gen 4 only (not Gen 3, Gen 5, Gen 6, or G19X)
- Radian part number: R0874
- UPC: 810098421058
- Caliber: 9mm
- Barrel: match-grade, ported, threadless muzzle, hardened 416R stainless steel
- Compensator: hardened stainless steel with angled front faces to ease holstering
- Finish: gray Radianite barrel, black Radianite compensator
- Mounting: INTRA-LOK tapered screw, torqued to 15 in.-lb.
- Maintenance: coat the barrel-to-compensator interface with heat-resistant gun oil to prevent carbon lock
- In the box: RAMJET barrel, AFTERBURNER compensator, INTRA-LOK tapered screw, TORX bit
- Legality: sold by Radian as legal for sale in all 50 states
Glock 19 Gen 4 fitment notes
This kit is cut for the Glock 19 Gen 4 only. The Gen 4 introduced the dual recoil spring assembly and interchangeable backstraps, and Radian machines a dedicated barrel for it rather than a one-size-fits-all part. A Gen 4 slide is roll-marked Gen4 beside the model number, so it is easy to confirm before you order. This is not the right kit for a Gen 3, a Gen 5, or a G19X.
The Gen 4 G19 keeps its factory dual recoil spring assembly with the Radian Ramjet Glock 19 Gen 4 Two Tone, so there is nothing else to buy to get it running. Some owners add a Radian Compressor guide rod later to fine-tune spring weight, especially if they shoot a mix of light range ammunition and full-power carry loads.
Installing it at the bench
Installation takes a few minutes. Remove the magazine, visually confirm the chamber is empty, and field strip the slide as the factory manual describes. Pull the recoil spring assembly and the factory barrel, put a light coat of oil on the RAMJET barrel exterior and hood, and drop it into the slide. Reinstall the recoil spring, slide the AFTERBURNER over the muzzle, and tighten the tapered screw to 15 inch-pounds with the supplied TORX bit. Reassemble, then function check before live fire. Keep the factory barrel: the Radian Ramjet Glock 19 Gen 4 Two Tone returns to stock just as easily.
Honest trade-offs to weigh first
A compensator is not free performance. The Radian Ramjet Glock 19 Gen 4 Two Tone is louder and more concussive for you and anyone beside you at the range, and shooting from a retention position close to the body puts hot gas and unburnt powder near your face and clothing. Barrel ports also add visible muzzle flash in low light. If the pistol wears a red dot, expect the lens to collect carbon faster and plan to wipe it after each range trip.
Holster fit is the other question. The AFTERBURNER adds a little length and bulk at the muzzle, so many open-bottom Kydex holsters work while closed-end or tightly molded holsters may not. Check with your holster maker before you carry. Ported barrels also bleed off some gas, so weak or very light range ammunition may not cycle as reliably; run a few hundred rounds of your carry load first. The kit is designed for factory slides and fits many aftermarket slides, but confirm with Radian before ordering for a custom slide.
Who the Radian Ramjet Glock 19 Gen 4 Two Tone suits
The Radian Ramjet Glock 19 Gen 4 Two Tone makes sense for owners of a Gen 4 Glock 19 who train often and want flatter follow-up shots from a pistol they already trust. It also suits anyone shopping for a Glock 19 Gen 4 compensator that needs no threaded barrel. It is less compelling if you rarely shoot or love your current holster. For shooters who train regularly and want faster, flatter follow-up shots, the Radian Ramjet Glock 19 Gen 4 Two Tone is one of the cleanest upgrades available, since it leaves the slide and sights untouched.
Buy the Radian Ramjet Glock 19 Gen 4 Two Tone from MAG5 Firearms
MAG5 Firearms is a family-owned FFL dealer in Collegeville, Pennsylvania. Barrels and compensators are not firearms under federal law, so this kit ships to your door without a transfer. Prefer another finish? See our full Radian Weapons lineup, including the bronze Afterburner Ramjet. For Radian’s own documentation, visit the Radian Weapons product page. Questions about fit? Call 610-943-0010 or email [email protected] and we will help you set up the Radian Ramjet Glock 19 Gen 4 Two Tone with the right carry gear.
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