Heckler & Koch HK4 380 32 25 ACP 22LR Convertible Semi-Auto Pistol 1972 C&R
SOLD FOR: $2,475.00
LSB#: LSB250809NF040
Make: Heckler & Koch, HK
Model: Hk 4 Second Variation
Serial Number: 20007
Year of Manufacture: 1972 (IC date code)
Caliber: 9mm Kurz (.380 ACP), .22 LR, .25 ACP, and 32 ACP.
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 bottom of the frame in front of the trigger guard is marked “20007”, the left of the trigger guard has an eagle over “N” proof, “72” date and Ulm antler proof. The “9k” 380 ACP barrel is marked with “9k”, “HK” and a Nitro Proof. The .22LR barrel is marked “.22LR”, “HK” and “108250”. The 380 magazines are marked “HK 9k”. The 22 mag is marked “.22LR HK 3/72” on the second. The .32 barrel is marked “108379”, “7.65” and “HK”. The 32 magazine is marked “7.65 HK5/71”. The 25 ACP barrel is marked “6,35” with a Nitro Proof, “103132”, “HK”. The 25 ACP magazine is marked “6,35 HK 3/72”.
Barrel Length: 3.3”
Sights / Optics: The front sight is a simple 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. 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 Very Good condition.
Type of Finish: Blue & Black
Finish Originality: Original
Bore Condition: All of the bores are very bright with sharp rifling. There is no erosion. In this writer’s opinion all of the bores rate 10/10.
Overall Condition: This pistol retains about 99% of its metal finish. There is little to no operational or handling wear. The magazine well shows some very minor rub wear. The markings are clear. Overall this pistol is in 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 with a complete barrel and magazine set with recoil springs and an HK screwdriver. Please see photos.
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 1972-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 .380, .32 ACP, .25 ACP, .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 collectibility, 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! – L.S.
