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Running a suppressor on a tilting-barrel pistol without a booster is a quick way to turn your semi-auto into a single shot. That's where this piece comes in. The JK Armament JK155 piston in .578×28 is the caliber-specific heart of JK's booster system, machined from 17-4 PH stainless steel to handle the heat, carbon, and constant cycling that pistol suppressor use dishes out. The .578×28 thread pattern covers most factory threaded .45 ACP barrels along with plenty of 10mm setups, so if you're suppressing a big-bore pistol, odds are good this is the piston you need.
Keep in mind this is the piston only, not the complete booster. It's designed to drop into JK's HUB Piston Mount, which threads into any suppressor with the standard 1.375×24 HUB thread and roughly 1.8 inches of internal space for the booster housing. That means this piston isn't limited to JK 155 series cans. If you're running a HUB-compatible pistol or hybrid suppressor from another brand with JK's mount, this piston slots right in. It's also a smart pickup if you already own the mount with a 1/2×28 piston for your 9mm and want to move that same can over to a .45.
The piston is the hardest working part of a Nielsen device. It cycles with every shot, takes the brunt of the blast, and gets soaked in carbon and lead fouling. 17-4 PH stainless holds up to all of it, resisting wear on the threads and shrugging off corrosion when cleaning day gets pushed back a range trip or two. JK Armament machines these in the USA and backs their products with a lifetime guarantee, which says a lot about how much confidence they have in the machining.
Double-check your barrel's thread pitch before ordering, match it up, and you'll have a reliable, properly cycling suppressed pistol without any drama.
Yes, as long as you're using it with JK's HUB Piston Mount. The mount threads into any suppressor with the industry-standard 1.375×24 HUB thread, provided the can has around 1.8 inches of internal length to accommodate the booster housing. The piston itself is what interfaces with your barrel threads, so once the mount is in place, it works across HUB-compatible cans.
This listing is for the piston only. You'll also need the JK HUB Piston Mount, which houses the piston and spring and threads into your suppressor. If you already own the mount with a different thread size piston, this is exactly what you need to swap your can over to a .578×28 threaded barrel.
Most modern centerfire pistols like Glocks and SIGs use a short recoil, tilting-barrel action. Hanging the dead weight of a suppressor directly on the barrel keeps it from tilting and cycling properly. A booster, sometimes called a Nielsen device, isolates the suppressor's weight from the moving barrel so the pistol runs reliably shot after shot.
.578×28 is the standard thread pattern on most factory threaded .45 ACP barrels, and it shows up on plenty of 10mm barrels too. Check your barrel's documentation or the markings near the muzzle to confirm. If you're running a 9mm, you'll want the 1/2×28 version of this piston instead.
| UPC | 850064482072 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | JK155PISTON578X28 |
| Thread Pattern | .578"x28 |
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