Heckler & Koch HK4 380ACP, .32ACP & .22LR Convertible Semi-Auto Pistol 1982
SOLD FOR: $1,476.00
LSB#: WY250310DK010
Make: Heckler & Koch, HK
Model: HK 4 Second Variation
Serial Number: 33794
Year of Manufacture: 1982 (IC date code)
Caliber: 9mm Kurz (.380 ACP) and .22 LR.
Action Type: Single / Double Action Semi-Automatic Pistol convertible between 4 different calibers(this pistol includes .22LR, 32 ACP and 380 ACP) Via interchangeable barrels and magazines with slide mounted manual safety and heel style magazine release.
Markings: The left side of the slide is marked “HECKLER & KOCH GMBH / OBERNDORF/N MADE IN GERMANY” with an eagle proof mark in front of the serrations and “Mod. HK 4” behind the safety, the right is marked “HK INC ARL VA 22201” and the bottom-front is marked “33794”. The bottom of the frame in front of the trigger guard is marked “33794”, the left of the trigger guard has an eagle over “N” proof, “IC” date code and Ulm antler proof. The “9k” 380 ACP barrel is marked with “9k”, “HK IC” and “114031”. The .22LR barrel is marked “.22LR”, “HK IB” and “113099”. The 380 magazines are marked “HK 9k”. The 22 mags are marked “.22LR HK 6/70” on one, “.22LR HK 5/71” on the second, and the 3rd “HK.22LR”. The .32 barrel is marked “41249”, “7.65” and “HK”. The 32 magazine is marked “7.65 HK5/71”.
Barrel Length: 3.3”
Sights / Optics: The front sight is a simple black blade affixed to the front of the slide. The rear sight is a square notch sight dovetailed to the rear of the slide.
Stock Configuration & Condition: The grip is a one-piece checkered black polymer which wraps around the backstrap with a slight thumb-shelf on the left side for a right-handed shooter. The grip shows light surface lines, with some scattered minor marks and a small scuff on the lower edge of the right side. The grip shows no visible chips or cracks. The checkering is well defined and the screw head is sharp. Overall the grip is in about Excellent condition.
Type of Finish: Blue & Black
Finish Originality: Original
Bore Condition: The .22LR barrel: The bore is bright and the rifling is sharp there is no erosion in the bore. The feed ramp is smooth and shiny. In this writer’s opinion the bore rates 9.75/10.
The .380 ACP barrel: The bore is bright and the rifling is sharp there is no erosion in the bore. The feed ramp is smooth and shiny. In this writer’s opinion the bore rates 9.75/10.
The 32 ACP barrel: The bore is bright and the rifling is sharp there is no erosion in the bore. The feed ramp is smooth and shiny. There is some minor carbon fouling present on the edges of the grooves. In this writer’s opinion the bore rates 9.5/10.
Overall Condition: This pistol retains about 99% of its metal finish. There is a small blemish on the right side of the slide near the “1” at the end of the address line. The magazine well shows some very minor rub wear. The markings are clear. Overall this pistol is in Excellent to Excellent+ condition.
Mechanics: The action functions correctly both single and double action. The slide locks back on both an empty magazine and when there is no magazine. The slide is released by pulling the trigger or inserting a new magazine. This pistol has a thumb-safety and a magazine disconnect safety. We did not fire this pistol. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance standards.
Box, Paperwork & Accessories: This pistol includes: Two-piece gray cardboard HK box with metal-reinforced corners, Total of two 7-round .380 ACP magazines both in Excellent condition, Cleaning jag rod, paperwork, manual, Serial-matching test-target.
The 22LR kit includes an HK cardboard box with reinforced corners, Three magazines two with orange floor plates and one with a black floor plate all in excellent condition, the 22lr barrel, and screw driver with cleaning jag, 22LR extractor, and pin.
The second kit includes the 32 ACP barrel, an HK .380 Kit cardboard box with reinforced metal corners, one 32 ACP magazine in Very Good + condition, and screw driver kit with pull through jag and pin.
Our Assessment: The Heckler & Koch HK4 is historically significant as HK’s first handgun design, introduced in 1967 and heavily inspired by the Mauser HSc. Designed by Alex Seidel, one of HK’s co-founders, the HK4 was a compact, double-action, blowback-operated pistol intended for both law enforcement and civilian markets. The pistol’s ergonomic lines, exposed hammer, and safety closely resemble the Mauser HSc, but HK modernized the design with improved manufacturing techniques and materials. The HK4 was unique in its modular design, allowing the user to easily swap between four different calibers .380 ACP (9mm Kurz), .32 ACP (7.65mm), .25 ACP (6.35mm), and .22 LR by changing the barrel, recoil spring, and magazine.
This 1982-manufactured HK4 is a second-variation model, meaning it was part of later production runs after HK had made refinements to the design. It comes with the .380 ACP, .32 ACP, and .22 LR barrels, making it a highly desirable example with three calibers in one platform. The included two .380 magazines, one .32 ACP magazine, and three .22 LR magazines ensure that you have the correct feeding components for each caliber. Additionally, the presence of the original HK screwdriver tool kit adds to its collectability, as these were issued for barrel swaps and basic maintenance. The checkered black plastic grips are standard for the model, offering a classic look and a secure grip.
Though the HK4 was eventually phased out in favor of more modern HK pistols like the P7 and USP, it remains an important piece of HK history, marking the company’s transition from manufacturing military rifles to producing high-quality handguns. Its interchangeable caliber system was ahead of its time, and today, three barrel sets like this one are highly sought after by collectors. Please see our high quality photos via the link and best of luck with your bidding!!!-R.L.
