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Posted: 8/13/2005 1:14:41 PM EDT
Anyone use them in their Oly or other 9mm Setup ? I'd like to know how they work
I find the 32 rders a little long
I've rarely seen them for sale and most recently noticed that Sportsmansguide had them

Link Posted: 8/13/2005 1:19:46 PM EDT
It is not that hard to make a 32 into a 20. It is probably in the archives somewhere.....
Link Posted: 8/13/2005 6:21:32 PM EDT
[Last Edit: 8/13/2005 6:21:57 PM EDT by brushdog]
I thought the surplus 20 rounders were just 32 rounders with some type of insert to block any more rounds from being loaded.

I've seen some of the cut 20 rounders. Sten mags are pretty cheap and I'm sure they can be shortened with a little work.
Link Posted: 8/13/2005 7:09:03 PM EDT
yeah i had some. mine were junk though. They are the same size as 32 round mags. There are 2 brass rods fixed to the inside of the mag on each side. Basically turning it into a single column mag instead of double column.
Link Posted: 8/13/2005 10:30:27 PM EDT
The 20 rounders with the rods in them were Indian made and designed to change the magazine from staggered to stacked and supposedly improve reliability. I've never tried them myself so can't comment on them. I saw short 20rounders the other day but I can't remember where- I'll try to find the site again.
Link Posted: 8/15/2005 10:44:20 AM EDT
Link Posted: 8/15/2005 10:49:58 AM EDT
It's honestly not hard at all to shorten a 32-rounder into a 20-rounder.

Mine were (were, I say; I grew bored w/ the 9mm AR) made to hold 17 or 18 rounds.

All you have to do, really, is lop a couple of inches off of a 32-rounder, then re-form the tabs to hold the floorplate on.

I suppose whether you trim the spring, and how much to trim, depends on how short you want to make the magazine. It seems to make more sense to leave room for a full-length spring, considering the age of the sten magazines out there.

In all seriousness, it shouldn't take more than 15 minutes to make a 20-rounder, starting with a 32-rounder, a dremel tool, a cutoff wheel, and a pair of pliers. The sten mag bodies are VERY soft steel.

Link Posted: 8/16/2005 1:38:38 PM EDT
If your 32rd STEN mags have the "remaining rounds counter holes" in the backside, you can cut off the mag at about 1/8" below the bottom hole, cut about the same distance off the spring, grind/file/cut a step in the front and back of the mag were you just cut it off... fold out the the new "ears"... shape with a file to fit the floor plate.... and you have a 20rd. STEN mag.

You can use the piece you cut off as a template for how to make the new floor plate ears. Also... you might have to trim the bottom of the follower about 1/16" or so to make it "perfect". I made my 32rd STEN mags to accept 20.5 rounds of 9mm(almost 21).... it seemed to make loading a little easier, especially on a closed bolt.


Link Posted: 8/17/2005 10:06:03 AM EDT
Link Posted: 8/19/2005 8:04:06 AM EDT
Yup, just hack it shorter.....
Link Posted: 8/20/2005 6:08:15 AM EDT

Originally Posted By gunslingerdoc:
When I made mine...

I removed the guts. inverted the mag ( I put a piece of duct tape over the feed lips to keep the rounds in the mag),

dropped 21 rounds in (21 because I wanted a bit of follower 'play' when I inserted a fully loaded mag).

Dropped in the follower and marked it.

I added 1/8 inch and cut it off there.

I bent out some 'wings' for the baseplate to ride on and then dremmelled to fit.

I then shortened the spring by 1/3 and reassembled.

Then I decided I wanted it shorter so I wacked off another inch from the mag and the follower and reformed the the 'wings'

I made up 6 like this and all have run several K of FA fire (at least thats the report from the 2 guys that bought them.)

Too bad you didn't take pictures of your steps. That could have made a great tutorial.

Link Posted: 8/20/2005 9:54:17 AM EDT
IIRC, there was a pic tutorial posted "years" ago... say 2-3 years. It was when the Sten in the Colt/RRA style was the 'hot' topic.
Link Posted: 8/20/2005 11:49:05 AM EDT
[Last Edit: 8/20/2005 12:17:13 PM EDT by Vulcan94]
Thanks, I'll do a search on the Archive server and see what comes up.






These were all the topic I could find on the Archive server related to shorting Sten mags.

Link Posted: 8/21/2005 12:40:27 AM EDT
[Last Edit: 8/21/2005 12:42:01 AM EDT by Kaliburz]

Originally Posted by AR-fan in one of the archived threads:

1. - I loaded the number of rounds + one extra that I wanted the mag size to be into a stripped mag (no spring or follower). holding the mag upside down with the rounds in place I dropped the follower in and measured the distance from the bottom of the mag to the bottom of the legs on the sten follower. for the mag shown it was 4.5" up from the bottom. The reason for the extra round in the mag is to allow some room since the mag fits right up in the rifle bolt.

2. - I marked that measurement on the out side of the magazine and then a second line about a half inch down from that -- this lower line is the one that is cut all the way through.

3. - I used a dremel to cut the front and rear sections out, cutting back to that original line that was marked on the mag.

4. - I would put one of those tabs in a vise and bend at a right angle then switch to the other tab and bend it at a right angle also. After the tabs have both been bent go back now and tap each bend, with the mag in the vise, with a small hammer so the bends are nice and sharp.

5. - Cut those tabs back now so they match the tabs on the original base of the sten mag. Don't cut too much right away -- cut some and test by trying to slide the cap on the base of the mag.

6. - I cut the spring for this mag at 6.5" or 7" -- for longer mags start with the spring at least 3" longer than the mag and adjust/cut to meet your needs.

Man, that post was only last year..... heck...seems like it was a LONG time ago....
Link Posted: 8/21/2005 6:21:02 AM EDT

Originally Posted By Kaliburz:

Man, that post was only last year..... heck...seems like it was a LONG time ago....

Too bad the link to the picture isn't good anymore.

Link Posted: 8/26/2005 11:06:07 AM EDT
i did this and made a 25rd .223 mag. pretty cool.

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