Heckler & Koch HK4 .380ACP, .32ACP, 25ACP & .22LR Semi-Auto Pistol 1981
SOLD FOR: $2,634.00
LSB#: LSB260613WT006
Make: Heckler & Koch, HK
Model: Hk 4 Second Variation
Serial Number: 31541
Year of Manufacture: 1981 (IB date code)
Caliber: 9mm Kurz (.380 ACP), 7.65(32 ACP), 6.35(25 ACP) and .22 LR.
Action Type: Single / Double Action Semi-Automatic Pistol convertible between 4 different calibers Via interchangeable barrels and magazines with slide mounted manual safety and heel style magazine release. The pistol also has a magazine disconnect.
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 “31541”. The bottom of the frame in front of the trigger guard is marked “31541”, the left of the trigger guard has an eagle over “N” proof, “IB” date code and Ulm antler proof. The “9k” 380 ACP barrel is marked with “9k”, “HK IB”. The .22LR barrel is marked “.22LR”, “HK IB” and “114017”. The .32 barrel is marked “114663”, “7.65” and “HK”. The 25 ACP barrel is marked “106941”, “6.35”, “HK IB”. The 380 magazines are marked “HK 9k”. The 22 mag is marked “HK .22 LR”. The 32 magazine is marked “HK 7.65”. The 25 ACP mag is marked “HK 6.35”.
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 rub marks and scuffs. The grip shows no chips or cracks. The checkering is well defined and the screw head is sharp. Overall the grip is in about Very Good+ 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. In this writer’s opinion the bore rates 9.75/10.
The .25 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.
Overall Condition: This pistol retains about 98% of its metal finish. The left side of the slide shows a rub mark and what appears to be glue on the slide. The magazine well shows some very minor rub wear. The markings are clear. Overall this pistol is in Very Good+-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 a Two-piece gray cardboard HK box with metal-reinforced corners, 2x 7-round .380 ACP magazines, 1x 32 ACP magazine, 1x 25 ACP magazine, 1x 22 LR magazine all in Excellent condition, the four barrels with springs, small parts, 22 LR extractor, screwdriver, HK patches, manual, test target for each caliber, paperwork, and HK logoed wooden box with foam.
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 1981-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, 25 ACP and .22 LR barrels, making it a highly desirable example with four calibers in one platform. The included two .380 magazines, one .32 ACP magazine, one 25 ACP magazine and one .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, four 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.