The major change occurred at SN 100,000, in part due to GI parts starting to dry up. They started showing up around SN 18,xxx and the conversion continued to around SN 44,5xx and it's rare to find a GI style housing beyond that number.Ī second minor change was a change from the GI front sight retained with a key to a sight retained with an allen screw. These trigger housings were no longer compatible with GI stocks unless they were inletted to fit the wider housing. Universal only used this design for about a year before they introduced a second design with a constant width from trigger guard to mag well. The first major change (in about 1963) was the switch from GI trigger housings to an aluminum trigger housing using the same shape and profile (narrow around the trigger guard, wider around the magazine well). They were essentially a Universal manufactured receiver with surplus GI parts used for the balance of the carbine. The early Universal carbines had 100% parts commonality with GI M1 Carbines. ![]() There were over 450,000 of them made from 1961 through 1986 and the design varied a lot over that period of time. Universal M1 carbines have a bad reputation - but they are not all created equal.
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