could NOT be installed without major machine work. They were stamped G3. The most common of 1962s are the 11/62, which is identical to the 7/62 except that part of the batch were labeled HK41s. They had the altered location of the push-pin hole, therefore requiring substantial work to turn into a fully automatic G3. There is a mix of G3 and HK41 markings among these date stamps. 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. (Early 1966): Unlike the 1962 Semi-Auto G3s, these 1966 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 were painted black with a semi-gloss finish and