Open bolt 22lr

Big JD-From the hills

Big JD-From the hills

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I know there are a few open bolt 22lr rifles, I forget the names and models. Anyway I am wondering how they even work when a protruding firing pin would hang up on the rim of a casing, or if a cartrige jammed in the clip it may set it off?
 
There is no firing pin. There is a vertical ridge on the boltface, so the case cannot hang up on a projecting pin. Obviously, if the cartridge being fed were to hangup, the ridge is in contact with the case, and an out of battery discharge could occur. I suspect that the chambering is more generous than on conventional .22s, to facilitate smooth feeding. In addition to the Gevarm, .22s like this were made by Voere, and a company in Argentina.
 
Big JD-From the hills said:
So the fired shells would have an imprint right across the entire surface?
Click to expand...

Yes. There's no missing it. Upon seeing it, people often say, "What the heck?"

Important safety precautions with any open-bolt firearm include:
1. always feed from the magazine, and;
2. keep your fingers, hand, arm, whatever, clear of the ejection port.

Because you never know.
 
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The Gevarm used to be popular out on the prairies, many years ago. Lot of bunnies and gophers ended up on the wrong end of full-auto .22's with 25-round magazines. Sure, it was illegal, but there was not the paranoia that exists today, so no trouble if you didn't flaunt it.
I never did because I couldn't figure out how to make a Snider do that!

But they were all fun and fun is what thr sport is about.

Saw a gevarm at a gun show last year, really brought some memories back.
 
Just a little personal experience, my friends gevarm, worked at a very fast semi-auto rate, and I do mean a very very fast semi-auto 100% feed/eject rate with 22 longs.
Go figure? maybe it had something to do with the shorter 29 grain bullet.

One other note to JD, fellas help me out here, not only was the firing pin, a ridge on the open bolt, but I seem to remember no extractor/no ejector??
Just the residual gases pushing the empty out....i think?
I might be wrong on one point....
 
here is a pic of a gevarm a3

img0278ej5.jpg


img0281um7.jpg
 
Brutus said:
...One other note to JD, fellas help me out here, not only was the firing pin, a ridge on the open bolt, but I seem to remember no extractor/no ejector? Just the residual gases pushing the empty out.... think?
I might be wrong on one point...
Click to expand...

That's correct, no extractor. There is an ejector.
 
In the event of a misfire, the cartridge would have to be picked out of the chamber. In a blowback firearm, the case can pivot around the extractor when it is being ejected, for more positive function. Positive ejection is certainly not a problem with Gevarms or Voeres.
 
FYI - I just finished posting a picture and some info (a 2nd post) on my Gevarm E1 in the thread here titled Survival Rifle. Below is a photo of a page from the S.I.R. catalog of 1970-71 which offers several Gevarm .22s. Check it out.

Best regards, and HAPPY NEW YEAR TO ALL! ~ ~ ~ mauser

SIRCATALOGGEVELOTPAGE2.jpg
 
I have the 22 that was made in argentina and it looks like the gevarm a3. The gevarm 8rd and 20rd mags work in this gun. i think it is a close copy. I also wonder why everyone thinks that the hk270 22 magazine can be converted to gevarm. The mags are completely different in every respect. I have both guns.
 
Big JD, I could have showed you one last year
when you where out here to deliver that yugo
if I had known , you could have seen how it worked,
but it is gone now. very neat gun, different.
Marshall
 
For interests sake, i just picked up a Venturini Largo, made in argentina, that is open bolt as well. It has the vertical striker on the bolt. Havent taken it out yet but it looks neat and was dirt cheap.
 
can14 said:
I also wonder why everyone thinks that the hk270 22 magazine can be converted to gevarm.
Click to expand...

Here's from a US mag seller:

«H & K 270 .22LR Magazine
[maghk270] $19.99

Brand new old stock right from HK, 15 round .22LR blued steel mags for the HK270 rifle. The mag is also frequently adapted for VOERE .22 rifles and similar firearms. (These are also the same mags that Action Arms used for their UZI .22LR conversion kits with a plastic adapter around the outside of the mag, which is not included with the mag.) »

Voere .22 open bolt use the same mag as Gevarm.
 
Someone in EE was making and selling 20 round Gevarm mags several months ago, neat guns, shot a vveeerrryyyy fast semi when I was kid, still have burn marks on my back from an empty going down my shirt. Worth every second of pain.. McLeods stores sold tons of them, there was a 50 shot drum apparently available but I never saw one. With a very fast one if you held it with the ejection port down [punk style] they ejected easier, and didn't scorch you.:50cal:
 
Brutus said:
Just a little personal experience, my friends gevarm, worked at a very fast semi-auto rate, and I do mean a very very fast semi-auto 100% feed/eject rate with 22 longs.
Go figure? maybe it had something to do with the shorter 29 grain bullet.

One other note to JD, fellas help me out here, not only was the firing pin, a ridge on the open bolt, but I seem to remember no extractor/no ejector??
Just the residual gases pushing the empty out....i think?
I might be wrong on one point....
Click to expand...

what happens is the case comes out via blow back so no extractor needed. On the magazine the left lip is a little longer than the right one ( 1/8 inch or so). So when the case come backs it hits the left side lip first, pivots and flips out the ejection port. I've been told when the left lip wears out preople have repaired them with solder and filing.

you can vary the cycle speed depending on the ammo . There is a steel recoil spring guide tube which can be reversed and put in the bolt to increase its reciprocating mass thereby slowing the cycle speed for use with high velocity ammo.

The scarce items for these are the magazines - maybe because of wearout of the feed lips. 20 rounders were going for $100 a couple of years ago. I bought a couple of the new ones and they work fine they're tighter than the oriiginals.

They are a great little rifle if a little funky to shoot- in rapid fire, you can feel the bolt thunking back and forth.
 
I've had a lot of failure to fire problems with the E1 when doing any kind of rapid-ish fire. Cartridge comes in on an angle and gets struck on the side rather than the end. Not sure why that happens, but always a bit unnerving to pull out an unfired cartridge with a hell of a serious bend in it.
 
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