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The lack of this disassembly notch is also depicted in figure 1 of the patent.

Universal M1 Carbine Plus Parts Dwindled

As the availability of GI surplus parts dwindled commercial equivalents were manufactured.

Several parts, such as the slide, were difficult to machine correctly.

Universals solution to these problems was to significantly redesign their carbines.

To a degree the end result should no longer be viewed as a replica of the U.S..30 caliber carbine, Model M1.

While similar in appearance and using the same cartridge the majority of their carbine and its parts were no longer interchangeable with parts used with their earlier carbines, the replica carbines.

This major change has been the cause of much criticism as Universals hybrid has historically been compared to carbines of the design of the U.S.

The change did create a number of minor problems.

Of the 420,000 carbines manufactured by Universal 1962-1984 over 350,000 of them were their hybrid version manufactured 1967-1984.

Abe Seiderman, inventor of the design, authored a letter to customers giving an overview of some of the changes and why they were made.

One adverse effect of this design change didnt become an issue until several years after Universal was no longer in business.

The title of the patent can be misleading, as the gas piston was just one small part of this overall significant redesign of the carbine manufactured by Universal.

Universal did not implement all of the design changes indicated in this patent at the same time.

Universal M1 Carbine Manual And Automatic

The Combination Manual and Automatic Bolt Action was a two piece gas piston (refer Fig.

The pin in the gas housing goes through the forward half of the.

By removing the pin, the forward half of the piston can be rotated 180 degrees and pinned back in place, opening or closing the gas flow.

Universal used GI or GI compatible slides up until the time they switched to the new design.

The slide that Universal used to replace the GI style slide fits only Universals redesigned carbine.

This slide will not fit on any other carbine made by anyone else.

It will.

This slide was specifically designed to work with the Universal two spring recoil system.

There are variations to this Universal slide, but all of them have one obvious trait that makes them easy to identify.

As mentioned above, Universals modified slide with the hole for the bolt lug had several variations.

If the need arises to replace this slide, it is important to know.

Unlike the GI style slides, none of the newly designed Universal slides have any.

In the photograph above left, close examination of the slide groove in the right side of the receiver reveals the GI style disassembly notch for removing.

Compare this to the receiver on the carbine in the photograph above right and you.