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The P7K3 is the most recent and smallest member of the P7 family.
Through the use of caliber conversion kits, each gun can be converted to three different calibers (Kalibers 3). Unlike the fixed barrel of the larger guns, the P7K3 barrel is held in place in the frame by a barrel nut. It can be removed and exchanged for a barrel of a different caliber. The barrels have polygon profile bores.
When converting to .22 LR, which is a rim fire round, the whole slide must also be exchanged. This second slide is part of the .22 LR conversion kit. The .22 LR conversion barrel has an unusual "piston" in the end of the barrel with the actual .22 chamber in this piston, When the gun fires the chamber pressure is applied to the entire area of the piston, and not just the cartridge. This provides sufficient force to cycle the action.
The P7K3 has an inertia blow-back action, unlike the gas-retarded action of the P7M8, etc. It uses uses a hydraulic slide buffer in place of the gas-retarding piston of the larger guns in the family. A gauge is supplied with the gun to see if the little buffer piston is still sticking out far enough. If it isn't, then it is worn out. The piston could be replaced if HK would sell or give you one -- but they typically won't, so the gun is junk at that point. Check this when buying.
P7K3 Users Manual (English or German)
.22 LR Conversion
There are two variations of the P7K3 that I know of (and have owned), the USA Model and the German Model. The USA Model was the only one imported by H&K themselves -- other importers such as CCF imported the German Model.
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