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The HK91 is a semiautomatic rifle version of the Heckler & Koch G3 automatic rifle that was produced by Heckler & Koch for the civilian market in the 1960s. It is not to be confused with the similarly titled, but separate model, Heckler & Koch G41.
It is estimated that less than 400 HK41s were produced and even fewer imported into the U.S. for civilian consumption. Today, HK41s can sell for anywhere between $3000 and $6000 depending on the condition and the economy at the time. An original 1966 model with the push-pin hole in the receiver can sell for around $8500. These are very scarce because most of them were used as hosts for full-auto conversions prior to the May 1986 Machinegun Ban. A 1962 Semi-Auto HKG3 can sell for over $10,000.
There are two models of the HK41:
- HK41A2: Fixed stock and semi-auto "SE" trigger group.
- HK41A3: Retractable 1-position stock and semi-auto "SE" trigger group.
Versions of the HK41Edit
- (1962): These models were identical to the G3 Automatic Rifle except for having a swing-down semi-auto "SE" grip assemblies and a modified bolt carrier. They were even stamped "G3" at first, but then H&K changed their name to "HK41" in an attempt to stay ahead of West-German Laws which prohibited civilian ownership of the G3 Automatic Rifle. These were date stamped "11/62".
- (Early 1966): Unlike the 1962 Semi-Auto G3s, these 1964 models had the "push-pin" hole in the correct place and thus could be quickly converted to an automatic by replacing the grip assembly with a full-auto "SEF" trigger group. These had a magnesium phosphate parkerized finish, matching hardwood furniture (stock and forearm grip) and were date stamped "6/66". Even though these versions have the push-pin hole in the receiver, they were grandfathered in as approved firearms after the passage of the Gun Control Act of 1968.
- (1966-1973): These models have strips of metal welded into the receiver and matching cuts made in the "SE" trigger group to only allow the insertion of an "SE" trigger group. These versions still had the a functional "flapper" magazine release and the push-pin hole. These rifles had a matte black finish with a matching black stock and forearm grip, and were date stamped "11/66". Very few of the 1966 models got into the U.S. However, between 1967 and 1974, none of these models were imported into the U.S, in part due to the Gun Control Act of 1968.
- (1974): These models had the locking-pin tabs eliminated on the front end of the grip assembly, and the corresponding locking-pin hole ("push-pin" hole) and bushing at the base of the receiver had a "U"-shaped piece of metal inserted to prevent the attachment of a full-auto "SEF" trigger group. This makes the "flapper" magazine-release paddle between the trigger guard and magazine well inoperative, making the redundant release button on the right-hand side of the receiver the only way to eject the magazine. It also had the cocking-lever endcap altered to prohibit the mounting of most models of the HK G3 bayonet and had the snap rings on the barrel removed so that it couldn't fire rifle grenades. These painted black with a semi-gloss finish and were date stamped "1/74".
United States ImportersEdit
- Golden State Arms Co., Santa Fe Division [Pasadena, CA] = From 1962 to 1966.
- Security Arms Company (SACO) [Arlington, VA] = From 1974 to 1975.
- Heckler & Koch [Arlington, VA] = Took over the US import business themselves in 1976.
There are four models of the HK91:
- HK91A2: Fixed stock and semi-auto "SE" or "0-1" trigger group.
- HK91A3: Retractable 1-position stock and semi-auto "SE" or "0-1" trigger group.
- HK91A4: Fixed stock, semi-auto "SE" or "0-1" trigger group and Select Polygonal Bore.
- HK91A5: Retractable 1-position stock, semi-auto "SE" or "0-1" trigger group and Select Polygonal Bore.
The reasons why Heckler & Koch renamed the HK41 in 1974 are unclear. Part of their reasoning could have been that they wanted to change the perception of the rifle as being a semi-automatic sporting rifle instead of a paramilitary rifle. Furthermore, gun laws that were adopted in West Germany around that time prohibited the civilian ownership of paramilitary rifles. (As a side note, HK41s that were sold in West Germany came without flash suppressors because they were prohibited under the West German gun laws). As a result, Heckler & Koch modified the weapon with a plate welded inside the receiver to prevent the mounting of a full-auto "SEF" fire control group and re-designated the rifle as the Heckler & Koch HK91. Late pattern HK41s and HK91s are virtually identical in appearance (except for the receiver markings and the retaining hole of the cocking tube end cap) and all their parts are interchangeable. The last few HK91s that were delivered to the U.S. in 1989 were blocked by customs after President George H. W. Bush issued an Executive Order banning the importation of "non-sporting" rifles. These were slightly modified, to remove "non-sporting" features like the flash suppressor, and the receivers re-stamped as the HK911, forming a transitional model between the HK91 and the HK SR9.
The HK91 is rather valuable in the United States firearm market since it was banned from further importation by executive order in 1989. Only 48,817 HK91s were imported into the U.S. prior to 1989. The retail price for an HK91 in the late 1970s was roughly $380 for the standard A2 models and $50 more for the A3 version. Prior to 1979, H&K did limited production runs of HK91s with polygonal rifle barrels. These were only $10 more than their standard counterparts. Today, original HK91s often fetch over $2000. The early 1974 'SACO' imports that are in good condition, which have the old style "SF" marked grip frame housings, are desirable among H&K collectors. So are the 1988 and 1989 "Chantilly" models, which have the same satin semi-gloss black finish as the later HK SR9s.
Clones are available, such as the JLD PTR 91, which are built on the tooling used by arms-maker FMP to make the receivers of the Portuguese military's versions of the G3, the M/961 and M/963. Heckler & Koch's receiver tooling was sold to the American company Ohio Rapid Fire, which is in the process of setting up to produce receivers.