The 0.578x28 piston/adapter for the IMPULS II-A suppresor was of great benefit, replacing a 16x1 LH piston as used on a HK USP 45 Tactical. The new piston allowed for use of the same supressor on multiple other pistols, having the more conventional tactical barrel 0.578x28 threads. It worked perfectly for an FN 545, and will offer an adaptability for use with .40 cal and a 10mm also.