Type 3 slide question

[jond41403]

hello all,
I was hoping to get some professional opinions on this before I attempted to use it as a spare on my carbine. I have a type 3 slide that was labeled a type 4 when I bought it.I should have caught the arm joint differences in the pictures on the listing but I didn't catch it until I held it in my hand. I'm thinking about keeping it if it poses no safety issues. My carbine currently has a type 4 slide which has the increased dwell time to my understanding. Does a type 3 slide on a shooter carbine pose any risks? Would a type 3 allow the bolt to open too quickly before the pressure from the cartridge has fully been released? I do not want any hot gases thrown in my face and this would be used on a spring tube Winchester that has been well-used and has fired who knows how many thousands of rounds during its life besides the thousands of rounds I have put through it myself over the years. Any and all opinions would be greatly appreciated, thanks everyone

Information

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[us019255]

Just looked at all the slide differences. Most changes were made just to increase durability. The rest seem to be aimed at exact tuning of ejection. My take is they all worked and safely. I have never been a collector who tried to restore to exact configuration at factory and I suspect that I have a variety of slide types in my safe.

[tenOC]

True, you shouldn't experience any problems. Some NPM slides are a hybrid slide. If yours is marked N15 (I think) in the slide bucket it may be one.

[jond41403]

True, you shouldn't experience any problems. Some NPM slides are a hybrid slide. If yours is marked N15 (I think) in the slide bucket it may be one.

The type 4 slide that is on my carbine now is an IBM marked EE AOB.the type 3 slide I received is an IBM marked C AOB

[AFJon]

The U.S. Caliber .30 Carbines - Slides

Issue with the Type 3 is the possibility of bending or breakage. You'd be better off using the existing slide.

[jond41403]

The U.S. Caliber .30 Carbines - Slides

Issue with the Type 3 is the possibility of bending or breakage. You'd be better off using the existing slide.

That's what I was thinking too. That's why I tried to buy another type 4 in case I needed to replace the type 4 that's already on my carbine.I just didn't realize it was a type 3 until it arrived in the mail. I'm thinking I will just send it back and get another type 4(which is what I thought I was buying in the first place). I guess that's what I get for ordering something at 2 in the morning and half asleep. The seller had it labeled as a type 4 and I should have caught the mistake because his pictures clearly showed a type 3 once I realized what I had in my hand and went back and looked at the pictures closer.I knew about the arm joint being weaker but I was more concerned with the type 3's not having the dwell time machined in like the type 4's do. I thought maybe they made this change because the bolt was opening too fast before the pressures could be released

[jond41403]

Thank you everyone for your time and information. I really appreciate it

[painter777]

IIRC,
There is no Dwell/Timing change between the Type III vs Type IV Slide.
The arm joint on the Type IV was increased in size 'because of the concern of possible breakage at the narrow joint on the Type III'.
The Type IV is born.
This being in part to the bulking up of parts for the grenade launchers and incoming M2. Like the introduction of the Round bolt.
It wasn't until the last batch of the Type V Slides (most with part #) that we seen the Dwell, Slide travel and Cam angle changes. Double check rear wall thickness.... the thinner rear wall normally has all the updates. More to these than just the width of the arm joint and angled cam.

In short, Difference between a T III vs T IV Op Slide is just the Arm joint size.
I've seen a few pictures of broken slides, but Far more of Bolts with broken right lugs.

Best for shooting, take advantage of the proven updates...... T-V or T-VI Slide, Round Bolt, Last style Ejector and Extractor

The Sleeplessone covers it very well on his Op slide and Round bolt pages:
Slides: The U.S. Caliber .30 Carbines - Slides
Bolts: The U.S. Caliber .30 Carbines - Parts

I have 2 shooter carbines that have the T III Op slides. I've never had to swap out any type of slide.
I have........... Replaced 2 N14 Flat bolts with cracked right lugs.

IMO, One will most likely have problems with a bolt, mag or extractor issues.
Keep your lug guides burr free and lubed..... and shoot it!
That WRA Springtube was weaned on inferior parts from way back in late 42 or early 43.

[jond41403]

Thanks Charlie, I had my slides mixed up! I thought the timing changes started with the 4's. There are so many differences with all these different types of parts I don't see how you guys keep up with it all ha ha.thanks again guys

[Bubba-7]

There are type 4 slides that have the long dwell modification. Not every manufacturer but some did.