Description
The Radian Afterburner Ramjet P365 XL is Radian Weapons’ threadless compensator kit for SIG Sauer P365XL, sold as part number R0840. It pairs the RAMJET ported pistol barrel with the AFTERBURNER micro-compensator, joined by Radian’s INTRA-LOK taper interface. There are no muzzle threads to cut and no gunsmithing involved: the barrel drops into the slide and the compensator clamps to it. MAG5 Firearms stocks the black Radianite version under UPC 810098420662.
How the Radian Afterburner Ramjet P365 XL works
The Ramjet ported barrel is match-grade, cut-rifled and machined from hardened 416R stainless steel. It is fluted to shed weight and heat, and a gas sealing chamber sits behind the muzzle to route propellant gas into the compensator instead of letting it vent straight forward. Because the muzzle is left unthreaded, the Radian Afterburner Ramjet P365 XL stays usable in states that restrict threaded handgun barrels, and a loaded chamber indicator is cut into the hood.
The Afterburner micro compensator slides over that gas chamber and locks down on one tapered screw at 15 inch-pounds. That is what the threadless INTRA-LOK mount buys you: no thread timing, no crush washer, no thread locker to break free later, and the whole assembly comes back off in a couple of minutes. Radian rates the barrel and compensator together at a 44 percent reduction in felt recoil with 115-grain ammunition.
Radian Afterburner Ramjet P365 XL specifications
- Fitment: the 3.7″ SIG Sauer P365XL
- Barrel: match-grade, cut-rifled, fluted, ported, non-threaded muzzle
- Barrel material: hardened 416R stainless steel
- Compensator material: hardened stainless steel
- Finish: Radianite black on both components
- Mounting: INTRA-LOK tapered screw, 15 in.-lb.
- Ammunition: 9mm, 115 grain and heavier
- In the box: Ramjet barrel, Afterburner compensator, tapered screw, TORX bit
Radian publishes the full fitment chart and torque figures on its own product page.
What the Radian Afterburner Ramjet P365 XL changes on the range
A SIG P365 XL compensator has a slightly easier job than the 3.1 inch version, because the XL is already the flatter-shooting gun. The P365 XL ported barrel adds to a longer sight radius and a bit more mass, so the two changes compound rather than compete.
The threadless INTRA-LOK mount matters here for a practical reason: the XL is a carry gun for a lot of owners, and being able to pull the compensator off for a class, a match or a range trip without a wrench and a bottle of thread locker is what makes that realistic.
Fitment and holsters
Check the fitment before you order, because these kits are not interchangeable between models or generations; the hood and lug geometry differ. This Radian Afterburner Ramjet P365 XL is cut for the 3.7″ SIG Sauer P365XL, and nothing else. Radian builds separate part numbers for every other host pistol, and none of them cross over.
The XL’s longer slide already needs its own holster, and the compensator adds more in front of that. Check for a comp-cut P365XL shell before ordering; a plain XL holster will not close over the muzzle device.
The honest caveats
A compensator is not free performance, and the Radian Afterburner Ramjet P365 XL is no exception. Redirecting gas upward makes the pistol noticeably louder to the shooter and to anyone standing beside you, and it throws more gas, unburned powder and particulate back toward your face. Indoors, or shooting from a compressed retention position, that is genuinely unpleasant.
Ported barrels and compensators also foul quickly. Expect to scrub carbon out of the Afterburner micro compensator far more often than you would clean a plain muzzle, and expect the Radian Afterburner Ramjet P365 XL to want cleaning on a schedule closer to a suppressed gun than a stock one.
Hanging a compensator on the gun also changes slide timing. Radian says plainly that the Radian Afterburner Ramjet P365 XL can require adjustment to recoil spring, lubrication or ammunition choice. Light 115-grain range loads are the floor the system is designed around, and anything weaker can short-stroke. If the pistol has a defensive role, put a couple hundred rounds of your actual carry load through it before you trust the setup.
Check local law as well. The Ramjet ported barrel ships unthreaded and is sold as fifty-state legal, but some municipalities restrict compensated or ported handguns, and several competition divisions bar them from stock classes. Because there are no muzzle threads, the Radian Afterburner Ramjet P365 XL is not a suppressor host either; if a can is in your future, buy a threaded barrel instead.
Who the Radian Afterburner Ramjet P365 XL suits
P365XL shooters who want the flattest-tracking version of a gun that is already easier to run than the 3.1 inch. The longer sight radius and the compensator work in the same direction.
The Radian Afterburner Ramjet P365 XL comes off in minutes and leaves no permanent change to the pistol, so it is a reversible experiment rather than a commitment. If you run a Gen 6 Glock as well, we stock the all-black Glock 19/45 Gen 6 kit, and the Radian Glock 19 quick-tune guide rod is the usual companion for dialling recoil spring weight back in once the compensator changes the timing.
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