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A tilting-barrel pistol needs a little help cycling with a can hanging off the muzzle, and the piston is the part doing the heavy lifting. This Yankee Hill Machine Nielsen piston in .578×28 is the go-to thread pitch for most .45 ACP threaded barrels, and it drops right into YHM's booster housing (YHM-2055) along with plenty of other popular pistol suppressors that run standard Nielsen-style pistons. If you're setting up a suppressed 1911, Glock 21, or similar .45 host, this is the piece that ties the whole system together.
YHM machines these pistons from 17-4 stainless steel and heat treats them for strength and corrosion resistance. That matters on a part that lives in the dirtiest spot on your entire setup, soaking up carbon, heat, and repeated impact every time the action cycles. At 1.40 ounces, it adds next to nothing to the reciprocating mass, and the machine work is clean and consistent, which is what you want on a component where alignment is everything.
What sets this piston apart from a lot of the budget options is the 10 indexed adjustment points. Adding a suppressor to a pistol almost always shifts your point of impact a bit, and instead of just living with it, you can rotate the piston through its index positions to walk your groups back where they belong. Once you find the sweet spot, it stays repeatable every time you mount up.
This piston works with the YHM booster assembly, the Sidewinder M2, and a wide range of common pistol suppressors on the market. One thing worth knowing before you order: it does not fit the original Sidewinder, so double check which generation you're running. Beyond that, if your barrel is threaded .578×28 and your can takes standard Nielsen pistons, you're in business. It's a simple, well-made part that does exactly one job and does it right.
Yes. In addition to YHM's own booster housing (YHM-2055) and the Sidewinder M2, this piston fits many popular pistol suppressors that use standard Nielsen-style pistons. Check your suppressor manufacturer's piston specs to confirm fitment, but compatibility across brands is pretty broad with this design.
No, and that's worth flagging before you buy. This piston works with the newer Sidewinder M2 but is not compatible with the original Sidewinder. If you're running the first-gen can, you'll need the piston made for that platform.
Hanging a suppressor on a pistol usually shifts your point of impact slightly. The 10 indexed positions let you rotate the piston to fine-tune that shift and bring your groups back to where your sights say they should be. Once set, the indexing keeps things repeatable every time you remount the can.
The .578×28 pitch is the standard thread for most .45 ACP threaded barrels, including common hosts like the Glock 21, threaded 1911s, and the HK45 series. If your barrel is marked .578×28 and your suppressor accepts standard Nielsen pistons, this is the size you want.
| UPC | 841812101635 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | YHM-2062-28 |
| Color | Silver |
| Length | 5.5500 |
| Model | |
| Product Type | Piston |
| Shipping Weight | 0.107 |
| Thread Pattern | .578"x28 |
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