Make: Heckler & Koch, HK

Model: HK91

Serial Number: A 036997

Year of Manufacture: 1981 (IB Date Code)

Caliber: .308 / 7.62x51

Action Type: Roller Delayed Blowback, Semi-Automatic Fed By Detachable Magazines

Markings: The left side of the mag-well is marked, “HK91 A 036997 / Cal..308” with an “IB” date code and Ulm proof. The right side of the receiver is marked, “Made In Germany HK Inc. Art. Va. 22 201”. Both sides of the trigger housing are marked, “0 1”. The forend is marked, “1IF”, the buttstock is marked, “6/3/76”. The aluminum magazine is marked, “G3HK 3/81”. The steel magazine is marked, “7.62x51 IB”.

Barrel Length: 18”. 19.5” with flash hider.

Sights / Optics: The front sight is a hooded post. The rear sight is a four position diopter drum adjustable peep sights and an open V-notch.

Stock Configuration & Condition: The stock is a three piece green polymer set with a slim open top G3 forend, finger grooved pistol grip, and drop comb stock with sling bar, holes for takedown pins, and ribbed plastic buttplate. There are light scratches and rub marks throughout consistent with normal wear and use. The texturing on the forend is sharp. There are no chips or cracks. The LOP is 14 3/4” from the front of the trigger to the back of the buttplate. The stock rates at about Good to Very Good overall condition.

Magazine Quantity & Condition: One 20rd Aluminum HK magazine in Very Good condition, and one 20rd steel HK magazine in Excellent condition.

Type of Finish: HK gray enamel, Parkerized

Finish Originality: Original

Bore Condition: The bore is very bright and the rifling is sharp. There is no erosion in the bore. In this writer’s opinion the bore rates at a 9.5/10.

Overall Condition: This rifle retains about 92% of its metal finish. There is light operation wear. There are light scratches throughout, and light wear and finish chipping at the magwell and the top of the receiver which is consistent with use of a scope mount. The front of the cocking tube has a bayonet lug adapter installed. The pins are unmarred. The markings are clear. Overall, this rifle rates in about Very Good condition.

Mechanics: The action functions correctly. We did not fire this rifle. As with all used firearms, a thorough cleaning may be necessary to meet your maintenance requirements.

Box, Paperwork & Accessories: 2 Magazines.

Our Assessment: This Heckler & Koch HK91 in .308 Winchester / 7.62x51mm NATO, manufactured in 1981, is a well regarded semi-automatic battle rifle, directly derived from the legendary G3 military rifle. Built on H&K’s roller-delayed blowback action, this rifle is known for its exceptional durability, reliability, and battlefield-proven design. Originally developed for military use, the civilian HK91 retains the same robust stamped steel receiver, fluted chamber for reliable extraction, and precise diopter drum sights, making it one of the most desirable Cold War-era battle rifles available on the civilian market. The 18-inch barrel provides an excellent balance of muzzle velocity, accuracy, and maneuverability, making this rifle well-suited for both long-range precision and practical field use. This example retains about 92% of its original finish, with minor handling wear, light scratches, and some finish chipping around the mag-well and receiver top, consistent with the use of a scope mount. The bore is exceptionally clean, with sharp rifling and no erosion, ensuring outstanding accuracy and longevity.

For collectors, military surplus enthusiasts, and those seeking a proven battle rifle, the HK91 is a premier choice. As an original German-made pre-ban rifle, it carries historical value, superior craftsmanship, and an enduring reputation for ruggedness and performance. Whether appreciated as a Cold War-era collectible, a hard-hitting semi-auto for the range, or a practical defensive rifle, this 1981 HK91 is an exceptional example of H&K’s engineering excellence. With its legendary roller-delayed action, military heritage, and limited civilian availability, this rifle remains one of the most iconic and desirable .308 battle rifles ever produced.