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Heckler & Koch P7K3

 

Model	Finish	Caliber(s)	Mag. Cap.	Barrel Length	Overall Length	Height	Width Across Grips	Weight w/o Magazine	Weight with Empty Magazine	Sight Radius
P7K3	Blue	.22 LR .32 ACP .380 ACP	8	3.8"	6.30"	4.92"	1.14"	1.71 lbs. 1.67 lbs. 1.65 lbs.	1.84 lbs. 1.80 lbs. 1.77 lbs.	5.47"

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.

Factory Target

The caliber conversion kits for the P7K3 come in a box like this. 

This one holds both a .32 kit and a .22 LR kit.  The .22 LR kit also includes a new slide, and a cleaning tool.
 

.22 LR Conversion

The conversion has a new slide to allow the use of rim fire (vs. center fire) ammo.
 

The barrel is a bit unusual in that it has a floating piston built into the end.  A scraper tool is supplied to scrape powder residue from the end of the barrel where the piston fits and from the piston.

When the round fires, the chamber pressure is applied to not just the area of the .22 LR cartridge head, but the area of the whole piston.  This generates a much higher force, which gives excellent cycling with the .22 LR round.  It is much better that it's predecessor (the HK4) which required hot ammo and a firm grip.

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.

The gun comes with two magazines, the barrel changing tool, a plastic box with the gun's serial number embossed, a manual and test target.

Barrel markings.

Note the one-piece metal rear sight, unique to the German Model.

Note the almost flat grip, unique to the German Model.

Importer, CCF RICHMOND VA engraved through bluing on this side.
Also note the front sight is sloped only on the front edge.

This side says HK Inc. Sterling VA, despite the CCF frame markings.  It appears to be part of the stamp that puts the HK logo on. 
Note that only the serial number, date code, and proofing marks are through the bluing.  On the USA Model, The Sterling VA is stamped through the bluing.
 

The USA model has a Wumpy-bump on the left grip.  Someone claimed the P7K3 was not USA-legal without it, didn't say why.

It also has an adjustable (two position elevation) plastic rear sight.

The Sterling VA seems to be stamped through the bluing.
Also note the front sight is sloped on both front and rear edges.

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