Description
The Radian Afterburner Ramjet P365 is Radian Weapons’ threadless compensator kit for SIG Sauer P365, sold as part number H0024. 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 810098420563.
How the Radian Afterburner Ramjet P365 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 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 specifications
- Fitment: the 3.1″ SIG Sauer P365
- 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 changes on the range
A SIG P365 compensator has more work to do than most. The P365 is small, light and fast in recoil, so a micro compact compensator produces a change you can see on the dot rather than one you have to measure. Shooters running the gun in classes tend to be the ones who notice it most.
The counterweight is proximity. On a micro-compact the muzzle sits closer to your face and hands than on any other 9mm, so the extra blast and particulate the compensator throws are correspondingly harder to ignore, especially from a compressed position.
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 is cut for the 3.1″ SIG Sauer P365, and nothing else. Radian builds separate part numbers for every other host pistol, and none of them cross over.
A compensator on a micro-compact changes the holster equation more than it does on a full-size gun. The added length has to be accommodated, and P365 holsters cut for a comp are a narrower market than plain ones. Budget for a new holster, not a modification.
The honest caveats
A compensator is not free performance, and the Radian Afterburner Ramjet P365 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 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 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 is not a suppressor host either; if a can is in your future, buy a threaded barrel instead.
Who the Radian Afterburner Ramjet P365 suits
P365 owners who shoot the gun a lot rather than only carry it. A micro-compact is the hardest 9mm to shoot flat, so this is where a compensator earns the most, and also where the added blast is most noticeable, because the muzzle sits closest to you.
The Radian Afterburner Ramjet P365 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.
Reviews
There are no reviews yet.