Sten MKll conversion

[f100rat]

Has any one heard of, or know anything about making a Sten semi auto? I know it is an open bolt gun and it couldn't be ez. Just wondering, Thanks.

[Gowking]

http://www.indianapolisordnance.com/sten_mk2.html

I am currently building a MK2 on one of their tubes and just received semi auto kit today. I also have a MK3 built on one of their tubes that uses an older version of the semi kit and I'm still tuning it to run correctly. The IO tube and semi kit are probably the easiest to get your Sten kit up and running. I am also about to start playing around with adapting an AR15 FCG as it should provide a better semi system that the one using 2 springs.

[johnyreb]

http://www.indianapolisordnance.com/sten_mk2.html

I am currently building a MK2 on one of their tubes and just received semi auto kit today. I also have a MK3 built on one of their tubes that uses an older version of the semi kit and I'm still tuning it to run correctly. The IO tube and semi kit are probably the easiest to get your Sten kit up and running. I am also about to start playing around with adapting an AR15 FCG as it should provide a better semi system that the one using 2 springs.

What he said.....

I have built a MK2(S) off that tube and parts and it was easy and fun.

I had tube with the same sze OD and ID of the receiver with a barrel nut welded to it with a cap. I inserted the 16" barrel and welded it in place to give it a MKII(s) look.

[f100rat]

Looks kool, how does it shoot and what are all the parts from the above Co. did you have to have ?

[johnyreb]

MkII parts kit off gunbroker and the IO kit and a 16" barrel both from IO directly.

[Wojtek]

I have a line on a Mk3 kit with bolt but no tube.

There is also this tutorial. http://www.humanevents.com/2012/06/19/sten-nation/

http://www.humanevents.com/2012/08/07/do-it-yourself-sten-part-ii/

[bigbob76]

This is the first I read about doing a Sten in 7.62x25, I guess I don't pay much attention to the non AK stuff. I have a Sten kit, I'll have to go figure out which of the MK models it is. If I get sucked into building any of these I'm going to make sure I blame all you guys

[Gowking]

If you do a MKII it's easy to change calibers. Simply switch the barrel and use a modified Sten mag to shoot 7.62x25.

[bigbob76]

If you do a MKII it's easy to change calibers. Simply switch the barrel and use a modified Sten mag to shoot 7.62x25.

It looks like I do have an MKII, it has the thumbhole steel stock. It would be cool to have barrels in both calibers. Do you guys lock the mag in some way, go featureless or what? The IO website looks interesting. Is anybody doing pistols?

[johnyreb]

I went with the full stock to avoid the thumb hole issue, and I have a wood block in my stock so no one can get silly and try to say the bottom of my full stock is a thumb hole. I covered the block with para cord.

The IO kit is great it comes with a reduced ID tube and a reduced bolt. All of the major work is done. Just open up the tube and weld her up and little bit of fine tuning on the recoil and striker springs and finish her up.


Super easy, but still fun. I finished my tube with a dremmel and a drill press. I used a long piece of angle iron as a guide in my vice to keep every thing nice and straight. All my cuts came out clean and straight and look like it was milled.

One word of caution....the recoil spring should be very strong.
I thought it was a bit to hard to pull so I trimmed it a bit....and I forgot how a striker fired blow back gun works....


Needless to say I am glad I was not holding the mag during testing when I had a OOB detonation...mag went about 6 feet. Lucky for me IO sends a extra set of springs. Went back to the recommended spring length and 1500+ rounds later it runs like a champ.

[Gowking]

That hole is to wrap the sling through it is not a thumb hole. The proper way to wrap your hand around it never involved placing your thumb through the hole and it is in fact quite uncomfortable to do so. That being said the Sten with the T stock is featureless IMO. If you aren't comfortable with that you could always fill the hole solid or at least weld a pin vertically in it to attach the sling at which point you can no longer erroneously fit a thumb through the hole.

IO has the 7.62x25 Tok barrels and the mod to the mag involves cutting out the inward hump along the spine. You can fill the slot or roll with it as is.

As for pistols yes there have been quite a few documented pistol builds. You would have to come up with a mag lock for the pistol. Basically build with original barrel and then use the paratrooper pistol grip instead of one of the full length stocks. With a MKII if you build it as a pistol then you can convert to rifle and back based on the same principle as the T/C Contender and Encore rifle/pistols. Just be sure to do it in the correct sequence of barrel then stock.

[f100rat]

You keep talking about a mag lock, Is that a Ca. law so you can't change mags? Why 762x25 instead of 9mm?

[bigbob76]

You keep talking about a mag lock, Is that a Ca. law so you can't change mags?

Yes, it makes it so that a tool (something other than your finger) is required to eject the mag.

Why 762x25 instead of 9mm?

Cheap surplus ammo, and also just to be different.

[Gowking]

Well not as cheap as it was a couple of years ago but its a great round to shoot and will increase your effective range with the Sten.