Swiss Arms SA 22 / Sig Mosquito Slide issue

Wallenstein

Wallenstein

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Hi, I have a new SA 22 (the re-marketed Sig Sauer Mosquito) and have run into an issue. It's a 22 LR chambered Semi Automatic, in 1911 style, but around 90% of the size.

It functioned well enough for the first 50 rounds, with Federal Blue Box HP ammo, but then the slide started to stick.

The gun would fire properly, eject the empty case, but then stay open, i.e. : the action would not move forwards again and chamber a new round.

I could, and tried a few times, manually force it forward to complete the action's movement, but decided to stop in case I ended up breaking anything.

I had cleaned it thoroughly prior to use.

Has anyone had a similar issue ?
 
Definitely something catching / rubbing against each other on the left top side inside between slide and action.

Cleaned it again, same issue.

Had a look at several You Tube videos and the slide lock screw isn't missing, nor is it any burr at the breech.
 
Are you shooting outdoors? I've noticed both my Beretta 92F .22 and Norinco NP58 will occasionally lock open as if the mag is empty but there's still rounds in it on my last two trips to the range. Release the slide catch and it functions as it should again. Wondering if the colder weather is affecting them somehow?
 
These lightweight slide .22 semi's need careful care of the meshing parts. Here's what I would do (and did do with my GSG .22). For the first few hundred rounds just use something like minimags to cycle the action. Something HV with a bit of "oomph". That will help things wear in but first I would strip down the firearm, clean everything and polish any contacting surfaces carefully. Remove any finish from overpainted areas carefully. Oil and reassemble and manually work the slide quite a few times. After a few hundred minimags things should run quite well. That federal ammo is OK but I've had a few light primer strikes with mine and it isn't as reliable than CCI minimags. Use the 40 grain plated round nose ammo too.

There's a good YouTube video showing what someone did to their GSG to polish it etc.
 
Last edited:
RK99 said:
Are you shooting outdoors? I've noticed both my Beretta 92F .22 and Norinco NP58 will occasionally lock open as if the mag is empty but there's still rounds in it on my last two trips to the range. Release the slide catch and it functions as it should again. Wondering if the colder weather is affecting them somehow?
Click to expand...

Yes, it was outdoors, but not on a particularly cold day.

I cleaned & tested the action indoors in normal room temp. and the slide still seems to catch on something even with the slide lock out of play.

I.e. : I pull it back and it stays back even though the spring should return it forward.
 
Alchemist said:
These lightweight slide .22 semi's need careful care of the meshing parts. Here's what I would do (and did do with my GSG .22). For the first few hundred rounds just use something like minimags to cycle the action. Something HV with a bit of "oomph". That will help things wear in but first I would strip down the firearm, clean everything and polish any contacting surfaces carefully. Remove any finish from overpainted areas carefully. Oil and reassemble and manually work the slide quite a few times. After a few hundred minimags things should run quite well. That federal ammo is OK but I've had a few light primer strikes with mine and it isn't as reliable than CCI minimags. Use the 40 grain plated round nose ammo too.

There's a good YouTube video showing what someone did to their GSG to polish it etc.
Click to expand...

I'll give it another go, and re-clean / work the slide and then test it on the CCI.

It just feels like there is a little bit of metal work that is not quite right / flush and catching / holding the slide back.
 
Wallenstein said:
I'll give it another go, and re-clean / work the slide and then test it on the CCI.

It just feels like there is a little bit of metal work that is not quite right / flush and catching / holding the slide back.
Click to expand...

Get a Dremel and some polishing compound out. I used some fine sanding blocks on mine too. For ####s and giggles I stripped off all the paint and polished the barrel for a small two tone effect too. Get right into the channels of the slide as well. If you slowly manipulate the slide you should be able to work out where you need to do the most work.
 
I found my wife's gun to be very sticky and ammo sensitive. I have bought and installed the lightest recoil spring i could find, but in all fairness nothing much changed. I looked at all ammo for the speed rating to see what worked the best and the recommended Mini Mags were by far the best, far more power, it totally changed the gun. I found I also did have to polish the slide mating surfaces and keep it well oiled with a thin synthetic oil. Now it runs flawless.
 
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