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Running a Gemtech GM-45, Lunar-45, or Blackside-45 on a metric-threaded host? This rear piston LID in M16x1 LH is the piece that makes it happen. It is the same Linear Inertial Decoupler core Gemtech builds into their .45 cans, just cut for the left-hand metric threads found on HK USP 45 barrels. Keep one in your range bag and your suppressor stops being a one-gun accessory.
Most folks who own a GM-45 or Lunar-45 end up wanting to run it on more than one pistol, and that usually means bouncing between US standard 1/2×28 or .578-28 threads and European metric patterns. Rather than buying a second can, a spare piston core lets you switch hosts by simply swapping the rear module. Gemtech designed these to come apart and go back together in the field without tools, so a thread change takes less time than loading a magazine. The LID system itself is what keeps a browning-style tilting barrel cycling reliably with the extra weight of a suppressor hanging off the muzzle, and this core carries that same function over to your metric-threaded host. It also plays fine on 9mm and .40 caliber pistols per Gemtech, which adds even more mileage to a .45 can you already own.
This is factory Gemtech part number 12191, threaded M16x1 left hand, which matches HK USP 45 pistols with factory metric muzzle threads. It drops into GM-45, Lunar-45, and Blackside-45 LID assemblies without modification. If your barrel wears a different thread pattern, Gemtech offers this same core in other pitches, so double-check what is stamped on your barrel or listed in your pistol manual before ordering. For USP 45 owners, though, this left-hand metric version is the one you want, and it is a genuine Gemtech component rather than an aftermarket workaround, so fit and lock-up stay consistent with the rest of your LID.
This piston core fits the Gemtech GM-45, Lunar-45, and Blackside-45 LID assemblies. It swaps directly into the rear module of any of those cans. It is a factory Gemtech part, so no fitting or modification is needed.
The M16x1 left-hand pattern matches HK USP 45 pistols with factory metric-threaded barrels. Always confirm the thread spec on your specific barrel before ordering, since HK has used both left-hand and right-hand metric threads across different models. If your barrel is 16×1 RH instead, Gemtech makes a separate piston for that pitch.
No. The LID system is designed so the piston core can be swapped in the field by hand, no tools required. That makes changing thread patterns between host pistols a quick job you can do right at the bench.
Yes, Gemtech notes this piston core can be run on 9mm and .40 caliber pistols in addition to .45 platforms, as long as the barrel threads match M16x1 LH. Shooting smaller calibers through a .45 can gives up a little sound performance versus a dedicated can, but it works fine and adds a lot of versatility.
| UPC | 609224345814 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 12191 |
| Length | 5.8 |
| Package Height | 1.5 |
| Package Width | 3.8 |
| Shipping Weight | 0.15 |
| Product Type | Accessory-Silencer Accessories |
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