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Old 08-16-2010, 11:08 AM
WIN 342 WIN 342 is offline
Join Date: Oct 2009
Posts: 1,919
Default M1 vs M2 Parts, whats the Difference?

Saw some carbine parts at a Show this weekend that were said to be M2 Carbine parts. Trigger Housing and slide looked no different to me than standard ones. So, How do I tell M2 parts from the standard M1 Parts. Ones in question were:

1. Trigger Housing Marked SA
2. Slide, new in cosmo marked SG
3. Trigger & sear
4. Hammer
5. Hammer spring and rod
6. Round Bolt marked W
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Old 08-16-2010, 11:23 AM
BQ97 BQ97 is offline
Join Date: Oct 2009
Posts: 1,473

The M2 trigger housing has the right hand side of the magazine well rear wall milled away and two semi circular cuts in the left side of the rear wall for the selector spring.

An M2 slide has the lower portion of the right side milled off, resulting in a step that contacts the disconnector lever.

There is no difference in the trigger. The sear has a raised portion on the top while the M1 sears are flat across the top.

The M2 hammer has a portion on the lower right side milled away for the disconnector.

There is no difference in the hammer spring, hammer spring plunger or bolt.
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Old 08-16-2010, 11:26 AM
aj98 aj98 is offline
Join Date: Oct 2009
Location: SE VA
Posts: 2,673

For the M2, in order for the extra parts to fit, the:
1. slide is cut different. Think you have to have a type 5 or 6.
Should have a long part number stamped in the bottom
2. sear should be a type 3
3. the stock has an extra cut on the top left (for the switch)
4. housing is cut different to make room for the extra parts

SA is postwar, and may be M2 ready, so to speak.

as far as I know, no changes in other parts.
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Old 08-16-2010, 11:30 AM
E-7Ret. E-7Ret. is offline
Join Date: Oct 2009
Location: Loveland, Ohio
Posts: 3,083

If he had all six of the required M2 parts he was in possession of a Machinegun. Bad Ju-Ju.
"Diligentia, Vis, Celeritas"
Jeff Cooper
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Old 08-16-2010, 11:35 AM
J.R.2009 J.R.2009 is online now
Join Date: Oct 2009
Location: Mt. Pleasant, SC
Posts: 7,859

"SA" on the trigger housing is a POST WAR replacement housing. An M2 housing is the type VI. Right side of the back of the mag well wall is cut away for the disconnector on the M2. Can be used and is found on many M1 carbines.

If your Op slide is a type V (5) and an M2 the arm where it is connected to the slide body has an angle cut on the bottom front corner, can be used and is found on both M1 & 2. "SG" is for Saginaw Gear in Saginaw Mich.

A type III sear has a hole and the front end has a slope to it. All other sears have a flat, though slightly curved top, some with holes. All can be found and used on M1 & 2.

The round bolt is a type III. It was not "made" for the M2 but just another production change. The "W" is for Winchester. There are several different "reasons" for the round design. You may get two or three reasons from this post.

Hammer spring and plunger were the same for both M1 & 2.

An M2 hammer, when looking at it from the front, has a cut out on the left side (looking at the front) bottom for the disconnector. Will work in both. Although you will probably never see one.

Pictures of these parts would be nice. We could tell you more about the parts.

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Old 08-16-2010, 07:54 PM
FTD1167 FTD1167 is offline
Join Date: Oct 2009
Location: Opelika,Al
Posts: 457

And don't forget the Stock...
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