Sig Mosquito


February 9, 2009, 02:21 AM
Can anyone give me any thoughts on the Sig Mosquito in .22? I've got a RIA 1911 in .45 but wanted another pistol...something a bit cheaper to shoot. And yes I know there's a .22 conversion for 1911's but i figure for the price, i might as well get a second pistol.

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2nd 41
February 9, 2009, 07:36 AM
I had an early Mos. I sold it as fast as I bought it. Worst pistol/gun I ever owned. Buy something else. I'm not bashing. Just telling my experience.

February 9, 2009, 02:06 PM
I read all of the negative things about the Mosquito; most were older models. I also read what recent owners said. Because I was looking for a new one, I discarded the old stuff. (Sort of like the Taurus owners of years ago.) I bought a new Sig Mosquito a year ago; mine has been just fine. I shoot CCI Mini-Mags in it and Remington Golden Bullet (525 bulk pack) with little or no problems. There are the occasional FTF's and FTE's but as I did not buy this firearm for SD, I could care less. The Mosquito breaks down very simply and is easy to clean. The DA/SA trigger comes in handy as rimfire ammo is not the most reliable stuff out there. Using the DA trigger to hit the round a 2nd time is nice. I bought extra mags from Top Gun Supply, as I have with my other 2 Sigs. One of the nice things about the Mosquito is that the controls, decocker, mag release and slide release are located in the same place as my other 2 Sigs.

February 9, 2009, 07:08 PM
Mine has given me no problems. It has been shot exclusively with a suppressor on it and feeds the Remington subsonics just fine.

February 9, 2009, 07:19 PM
I had 2 of the Mosquitos and both were big dissappointments.
Get a Browning Buckmark.

February 9, 2009, 07:41 PM
Mine works well. You do need to break them in properly, about 300 rounds of CCI minmags. Make sure to clean the new gun and the magazines. Be sure to put the spring in correctly. Fun pistol, great feel, I would recommend it. I also have a Browing Challenger III, precursor to the Buckmark. Great gun, but not a much fun as the SIG

February 9, 2009, 09:18 PM
The earlier generations of Mosquito’s had issues. Mine has a higher serial and has run fine – about 3000 rounds through it. Every .22 is going to have the odd ammunition troubles - just the nature of rimfire ammo. The Mosquito likes to be clean and wet. It loves CCI Mini-Mags. It does not like CCI Stingers or low velocity ammo (at least mine didn’t). Most of my failures actually pertained to the magazine, and not the pistol. Once I took the magazine follower out and buffed it with 1500 grit, I had significantly less issues. Using the proper spring for the ammo is also important, however, in my experience, mine runs fine with either spring and Mini-Mags.
Sure, the Browning and Ruger are the cadillacs of .22 handguns, but are you going to get into serious bullseye competition? If it's just for general plinking go with the Mosquito or Walther P22. You can find them for almost half the cost of a Browning or Ruger.
Here’s a 25 page thread discussing the Mosquito, detail stripping, trigger jobs, ammo, etc:


February 9, 2009, 09:27 PM
I bought one for my wife to learn how to shoot. It is great for that. She now knows how to clear almost any malfunction an autoloading pistol can dish out. My advice: buy a Ruger MKIII or MKII. Much more pistol for less money. My little brother has a Sig in .40 S&W. It's a great pistol. The Mosquito is just like its namesake-a pain. Just my experience, hope yours will be better.

February 9, 2009, 10:05 PM
If you're willing to spend just a little bit more, you can get a REAL Sig in .22lr --- Sig Sauer has started making the P220, the P226, and P229 in .22lr. And unless I'm mistaken, I believe the guns come with a certificate to get a discount on a factory-direct slide assembly, so you can make it a 9mm, .40, .357 SIG, or .45 ACP later on.

Given the so-so quality I've heard about the "plinker" .22lr pistols, like the Walther P22 or Sig Mosquito, I'd feel a lot better putting my money on a real Sig that I can upgrade later.

February 9, 2009, 10:31 PM
Ive sold a few of them and half of them come back with problems.

February 10, 2009, 12:23 AM
No problems with mine that I bought last summer.

February 10, 2009, 03:18 AM
Thanks guys. Sounds like it's just the older models i have to look out for. One more question..Do all the new ones come with that threaded barrel? I mean I guess it would be cool if i one day decided to go through all that paperwork to get a supressor..but if not... :-s or Do you know where i could get a replacement barrel for it? that way i could change the look out

February 10, 2009, 12:55 PM
You can still get the standard model, which does not have a threaded barrel. I was in an Academy store about a month ago and they were selling for $299 new. Academy also had factory magazines for sale at $20 each.
Mine likes CCI and Fed. American eagle copper bullets. I've had mixed results with the Rem. Golden bullets.

February 10, 2009, 01:43 PM
I just got the mosquito its a great little gun, however it DOES NOT like standard velocity ammo so you need to shoot the high velocity through it so it cycles right. I usually use the federal bulk box.

February 10, 2009, 04:27 PM
I too am in the market for a .22 handgun for cheap practice. To me ,on the surface, the sig mosquito sounds like one of the best available .22s to use with for training mainly because it has a grip, trigger and sights much like most sd caliber pistols. However, I keep hearing/reading so many bad things about them I might just get the Ruger 22/45 instead. I don't even have the patience for a picky .22 handgun, much less one that doesn't function well.

Shytheed Dumas
February 10, 2009, 07:38 PM
After reading up on all of them and weighing in ease of disassembly with accuracy, reliability & price, I think I have settled in on the S&W 22A. $260 at Bud's with great accuracy and reliability reports; +++ over what I had read on the Sig.

I had a MKIII a year or two ago and hated disassembly so bad that I ended up trading it for my first Kahr, even though it was a great little pistol. In hind sight, I was probably cleaning too much, anyway...

Jed Carter
February 11, 2009, 05:43 PM
Please correct me if I'm wrong, but the Sig mosquito is not actually manufactured by Sig Arms, it is built by the same company that manufactures the GSG-5 .22 Mp-5 clone. I own an GSG 5 pistol and it has some issues... the metal the chamber is made of looks like unhardened metal, may be some sort of coating... I hope. The 22 round magazines are touchy any pressure on it and it doesn't feed. It too needs high velocity ammunition.

February 11, 2009, 07:00 PM
I had one. Bought it new. It fed fired and ejected without issue, but was inaccurate compared to other .22's. I was surprised by it.

I sold it and bought a Trailside. It is a super gun, very accurate. They can be found reasonable and are a great buy. My Browning Buck Mark is also a better gun.

S&W 442's can be found used at reasonable cost and I would buy one of them over the Mosquito. Mine is not quite as nice as the other two I 22's I have, but not by much. It shoots very well. I would take one of them over the Mosquito as well.

February 11, 2009, 07:28 PM
Sig does not have a good reputation with there last two 22 RF pistols. The Trailside was a train wreck.

So they came out with the Mosquito it got off to a very rough start. From what I have seen at my local range I would not buy one.

February 11, 2009, 08:38 PM
Buy it, follow Sig's directions, and enjoy the cheap fun. It's a great plinker, it's not a precision target pistol, and if you keep it clean and lubed it works just fine. Mine's been flawless through many, many rounds. The trigger is NOT like a 1911 - by a long way. But you can do a quick trigger job on it yourself that smooths it out quite a bit. Check out the LONG, LONG thread on the Mosquito on the Sig Forum and check in with Mississippi Dave and Wrangler - they are the defacto experts on the skeeter.

February 11, 2009, 10:01 PM
I think i'll probably get it. Like
swmp9jrm said, it's not a precision target pistol...which is not what i need. I just want something i can take out back and pop off a couple of mags without feeling a dark empty feeling wallet lol.

October 28, 2010, 03:01 PM
My brother has one that jams if the take down lever screw is loose, We determined that the barrel will move slightly causing jams and bad accuracy, he's waiting for a replacement screw since his is out of commission.

October 28, 2010, 03:27 PM
Talk to your local gunsmith. Mine complained about how many they were getting back and talked me out of buying one. The store even stopped carrying them. But I recently saw they were back in stock so maybe they've fixed the problems.

I too ended up with a Buckmark, and it has been a stellar gun. And I don't mind taking it out in the brush, unlike my S&W 41.

October 28, 2010, 03:49 PM
I just sold mine a two weeks ago. Worst pistol I've ever owned, and it was a newer one (got it in March). I literally never had one single magazine that didn't have AT LEAST one FTF/FTE. Also, Gun-Tests magazine gave it an F- because it kaboomed on them while they were testing it (the first and only time that's ever happened to them).

October 28, 2010, 04:08 PM
Sig mosquitos really suck. They're not terrible plinkers, but that's all they'll ever be. I haven't fired that many rounds through mine, but I do know that it fails to feed very often, and as a result I drop the hammer on an empty chamber, which is bad for rimfire guns.

and HK-Freak's experience sums up mine as well; you cannot get a full magazine to cycle without at least one failure to feed or failure to extract.

There are better 22s out there. The Ruger mk. III comes to mind

October 28, 2010, 05:44 PM
I got to shoot one 3 days ago. A friend had purchased one and was having problems with jams. Told him to try several brands I tried winchester hyper velocities, etc. and he had purchased the CCI target. It jammed with the CCI target. I bought the CCI Mini Mags that have HP on the box and says Varmint at the bottom in teeny tiny letters. The gun fired all 100 rounds without a hitch. From now on he only buys the CCI Minimags HP Varmint.

October 28, 2010, 07:16 PM
Mine functions pretty much 100% with CCI Mini-Mags or Federal AutoMatch. I usually shoot AutoMatch out of mine because it's cheaper.

October 28, 2010, 08:16 PM
not a real fan of Gun Test after they gave a don't buy to the Saiga 12

October 28, 2010, 09:54 PM
I got a real good deal on a lightly used one that i picked up for my son we only run CCI through it , never a failure of any kind with it. Its not as accurate as i would like to see
but for a cheap plinker and training tool i have no complaints.

October 28, 2010, 10:07 PM
I know when I got my Mosquito, there was a bright slip of paper in the case that basically warned that you need to use CCI minimags with the spring that ships in the gun. There was another spring that came in the box for other ammo. There was also a coupon in the box for a minimag rebate or something.

I'm thinking that might be the trick, because I do have FTF quite a bit if i try to run mine 'out of the box' with standard ammo, but the CCI minimags seem to cycle fine. I've never tried the other spring, fwiw.

Pistol Ranch
January 28, 2011, 10:29 AM
I bought a Sig Mosquito last week despite dire warnings..I just so happens that I like Sig handguns and the Mosquito does not look like a toy.
I looked at the P22 but it was much too small for my hands.
Here's my analysis: Sig has some Q.C. issues with their INSTRUCTION MANUAL!!
Pistol is shipped with two recoil springs (One for "High Speed" ammo and one for cheap junk) The Mosquito was SUPPOSED to be shipped with the "High Speed" spring installed. Not So!! Mine came with the long "junk ammo" spring. Result, stovepipe on last round of magazine #1.
Instructions specify "white marked" spring. Bull****, there is no marking on either spring.
Instructions indicate that the Sport Version and Silencer Version are 207 in. long!! Probably meant to be 207 mm. The manual also indicates that the trigger "Pool" is 3,5-6,6 SA and 13,2-16 lbs DA.
Also, pistol is furnished with 3 front sights..There is no info in the manual about how to change the sight out..(You squeeze the prongs together from the bottom inside the front slide).
After I changed to the correct spring, I have absolutely no issues with the Mosquito.
It would be extremely helpful if Sig would fix/expand their Instruction Manual, ship the pistol with the correct spring installed, and employ someone that speaks english and thinks in inches, not millimeters!!
P.S. Mine was $299.95 at Academy Sports in Houston.

January 28, 2011, 11:28 AM
I like the feel of the pistol and the looks but,
I was using a friend of mines, its was one of the first gen i think... The thing was problem ridden, it was also very inaccurate with both barrels we used with it. The sights IMO are terrible, way to much play. The trigger was crazy... you had too pull it half an inch back and then it would engage then it would finally go off. The magazines were very poor at loading, FTF every other shot. Would only shoot CCI Stingers and sometimes fiochi high velocity. The pros to it was it felt good in the hands and well thats it... But it was new and even after 400rnds through it it was still rebelling. IDK if it was just a bad one or if there is something that wasn't reassembled right but Im sure were gonna have to work on it when he gets back from italy. Sooo, heres all the negative review for this thread. :P maybe someone has some good things to say

January 29, 2011, 09:42 PM
Mine runs like a freight train, no problems at all and reasonably accurate.

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