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Old 03-03-2005, 11:14 AM   #1
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Op slide types?

What is the difference between a type 3 and type 4 slide?
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Old 03-03-2005, 11:45 AM   #2
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Type 3 changed the rear of the box from the round cut to square, but for some reason reduced the arm joint to 7/32 inches wide. Type 4 increased the joint to 19/32 inches wide, increasing the strength of the arm joint. That's the only difference between Type 3 & 4, although we have seen some that didn't change the rear of the box right away, and speculate the manufactirers or subcontractors didn't always make the changes in sequence. As usual with Carbines, there are always exceptions to every "rule".
 
Old 03-03-2005, 11:49 AM   #3
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What's the best inexpensive book to buy that lists all the different parts types, along with approximations of which types were used on which manufacturer's rifles during which dates?
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Old 03-03-2005, 11:49 AM   #4
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there is also a type 5 right?
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Old 03-03-2005, 12:11 PM   #5
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War Baby and War Baby comes Home are good. I don't have copies, but read them both. Lots of info. Not inexpensive, that is why I didn't buy them. Check ebay, maybe you can get a deal.

or you may not....I saw some fool bid over 200 bucks for an Italian Repo M1A1 stock. They are 160 at Sarco, 120 at SG....a little research people.......I guess one is born everyday.
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Old 03-03-2005, 12:21 PM   #6
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Many systems have been tried Claven2, but we are now using Craig Riesch's "Typing System" as the standard. His book, U.S. M1 Carbines, Wartime Production fourth edition is the one we are using at this time, available for about $15 on eBay and other online auctions. It also gives approximate SN ranges for type changes, but they are way off in some cases, so only use them as a general guideline, not set in stone.
Audie, there were 6, maybe 7 "Types" of slides made, with the Type 5 being the bolt cam angled forward to improve the angle of ejection, along with a slight increase in travel by making the cam cut slightly larger. This reduced breech flash and improved extraction. The later Type 5 slides were marked 7160091 on the bottom, and some were machined for the M2 cut, making them a converted Type 6.
Type 6 are the M2 slides, wherein the right side of the box is machined for the disconnector lever, and the arm joint is cut at an angle to trip the lever when the slide is all the way forward. This allows a slight hesitation before releasing the hammer. If it just followed the bolt, it wouldn't allow the free-floating firing pin to travel to the rear, and wouldn't hit the primer with enough force to fire it. An ingenious design, the rivet holding the pivot lug on the disconnector lever is the weak link in the system, but holds up pretty well if lubed occasionally.
There were other subtle changes made to the slides such as the stop pin design and dropping of the pin that originally held it in place, but they don't rate "Types" by themselves.
 
Old 03-04-2005, 05:17 PM   #7
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And keep in mind that there are minor variations of each type as well. If you counted all of those by different manufacturers, you would probably end up with around 12 different types. These generally resulted from drawing changes either not arriving in order or slow implementation of changes due to some manufacturing difficulty.
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Old 03-10-2005, 06:44 PM   #8
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I just put a type 5 on my carbine. It has PI underlined in the box...I am assuming Inland. Has the correct number on the bottom.

It is a nice fit with almost no wear on the lugs. The front of the slide has an angle on it. I assume that deflects the casings more to the right. Also the handle is bigger than my old type 3.
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