Sig Mosquito Review

The SIG SAUER Mosquito is a scaled down .22lr version of the popular P226. The 90% smaller size Sig  22 has all the controls of the full size pistol with reduced recoil, less noise, and lower cost compared to shooting more expensive 9mm ammunition.  The Mosquito has a polymer frame with an accessory rail, a fixed barrel blowback system, 3 dot adjustable sights, and has the feel and accuracy of the full size pistol.

Sig Sauer Mosquito

Sig Sauer Mosquito

At first glance the little Sig is very appealing. I liked it as soon as I picked it up. It feels good in the hand and looks just like my full size Sig P226. I was excited to take it to the range for testing and practice shots but my range is closed during the Wisconsin deer hunting season. This gave me time to do some research to learn more about the gun. Unfortunately, the more I learned the more disappointed I became. It seems it is prone to feeding and jamming problems. There is a lot of information in the forums about this. It seems the feed ramp is part of the problem and there are many suggestions and examples of how to polish the feed ramp to help remedy the feeding and failure to eject issues. I wish I had done more research before I bought the Mosquito. I bought it because it looked good, and had the Sig Sauer name on it. Fortunately for me, I haven’t fired it yet so I will return it to my local gun shop and buy something else.

At this time I am having second thoughts about returning my new pistol. I viewed a few Sig Mosquito Reviews on YouTube. The problems seem to be very common and at least a few owners have made improvements to the feed ramp and chamber that greatly reduce the failures to feed and failures to eject.

Sig Sauer Mosquito Feels Good in the Hand

Sig Mosquito Feels Good in the Hand

Sig Sauer Mosquito Specifications

  • Caliber .22LR
  • Action Type DA/SA
  • Overall Length 7.2 in
  • Overall Height 5.3 in
  • Overall Width 1.5 in
  • Barrel Length 3.9 in
  • Sight Radius 5.5 in
  • Weight w/Mag 24.6 oz
  • Mag Capacity 10 Rounds
  • Sights Adjustable Rear
  • Grips Polymer
  • Frame Finish OD Green Finish
  • Slide Finish OD Green Finish
  • Accessory Rail Yes
  • Features OD Green Finish, Integral Accessory Rail
  • MSRP $419.00
  • CA Compliant Yes
  • MA Compliant Yes
Sig Sauer Mosquito Disassembled

Sig Sauer Mosquito Disassembled

Sig Sauer Mosquito Price – I found the Sig Sauer Mosquito for sale at my local Scheels gun shop for $349.95. It can be found on the Internet at Buds Gun Shop for $315.00 to $355.00 depending on model with free shipping to your FFL. has them ranging in price from $318.00 to $405.00 depending on model.

Sig Sauer Mosquito Take down – Take down is easy. Remove the magazine and check the chamber. Rotate the take down lever forward. Pull the slide assembly rearward and up. The slide comes right off. The pistol comes with two recoil springs that are suited for standard and high power ammunition.

Sig Mosquito Problems – The Sig Mosquito is a disappointment because it doesn’t live up to the expectations of the Sig Sauer name. The Mosquito has problems with jamming problems such as failures to feed, and failures to eject. Buying a gun with the name Sig Sauer on it makes one feel confident however, the Sig 22 Mosquito falls short in reliability. This may be due in part to the heavy slide and the fact that .22 caliber ammunition doesn’t have much power to spare. Compare the mass of a Browning Buck Mark slide and it is easy to understand that the Sig Mosquito has a heavier slide. The slide weight and the poor feed ramp design and finish make the Sig Sauer Mosquito a cool looking and feeling gun that is prone to jams.

Sig Mosquito Barrel – The barrel is secured by two screws. One screws in from the right side and one from the left side. The screw on the right side screws through the barrel mount and into the take down lever. The barrel is easily removed when necessary for cleaning or barrel replacement.

Sig Sauer Mosquito Threaded Barrel – The threaded barrel extends beyond the end of the pistol and is threaded to allow installation of a suppressor. If you don’t have a threaded barrel you can buy a replacement from The present price is $155.00 when they have them in stock.

Sig Sauer Mosquito Suppressor Sig Sauer Mosquito Silencer – A suppressor is a silencer that screws onto the end of the barrel. That is the purpose of the threaded barrel, to install a silencer. The suppressor for the Sig Sauer Mosquito Suppressor costs about $525.00 from

Sig Sauer Mosquito Laser – A feature of the Mosquito is an integral piccatinny rail that will accept a small laser. Small lasers are available for $35 to $50.

Sig Sauer Mosquito Grips – Decorative wood grips available from in the $100 range.

Sig Sauer Mosquito Sight Picture

Sig Sauer Mosquito Sight Picture

Sig Sauer Mosquito Sights – The Sig Sauer Mosquito 3 Dot Night Sights make it easy to acquire the target. Accuracy of the Mosquito is quite good although not in the same league with the Browning Buck Mark.

Sig Sauer Mosquito Models  – The Mosquito is available in several different models including one with a threaded barrel. The threaded barrel allows the use of a Suppressor and silencer.

Sig Sauer Mosquito Sig Sauer Mosquito Desert Digital Camo Sig Sauer Mosquito FDE
Sig Sauer Mosquito OD Green Sig Sauer Mosquito Pink Sig Sauer Mosquito Threaded Barrel
Sig Sauer Mosquito Two Tone

Sig Sauer Mosquito Nickel Two Tone

Sig Mosquito Two Tone


To sum up my Sig Sauer Mosquito Review I have mixed feelings about the gun. I like the look and feel of it but I am disappointed that Sig Sauer dropped the ball on reliability. I purchased the Sig Mosquito because of the name Sig Sauer. I own a Sig P226 and I assumed that this pistol was comparable. Not so! There are a couple issues that affect its reliability such as the feed ramp, the chamber, and the slide mass. Feed ramp and chamber polishing provide some improvement but there is still the weight of the slide that must be overcome to complete a cycle.

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Comments on this entry are closed.

  • MSGRAD Jul 30, 2014, 12:54 pm

    I purchased the Mosquito with some hesitation due to a lot of bad reviews but needed another .22 pistol and after handling several different brands I decided on the Sig. Needless to say I am very pleased with this pistol. I completely disassembled and thoroughly cleaned all parts, oiled, polished the feed ramp and reassembled. I took it to the range today with several different types of ammo (Remington Thunderbolt, CCI standard velocity, Blazer) these 3 were all RNL 40gr I also fired 50 rds of Federal 36gr copper plated through this pistol. I did not have one FTF, misfire, stovepipe or malfunction out of these 200rds, very pleased with this pistol (even though not mfg. by Sig). I would encourage anyone to buy this pistol and follow the cleaning, lubrication and feed ramp issue and feel you will be well satisfied with this handgun.

  • cebur19 Jul 4, 2013, 4:10 pm

    Yes the 22 cal guns can be finicky. Even two identical rifles will often shoot better with different brands of ammo. I know what you mean about the Mosquito. It feels just like the big guns and is so much cheaper to shoot.

  • Rick Jul 3, 2013, 10:08 pm

    I purchased the Sig Sauer Mosquito recently and then read this review. I had a similar experience and was disappointed since my favorite gun is the Sig Sauer P556. I was only able to get a cheap box of ammo and the gun jammed and did not eject the shells. After a little research and some searching I got a box of CCI .22 Mini Mags. WOW! what a difference! I LOVE THIS LITTLE GUN!!!! Shoots great, great feeling and accuracy. Just like a BMW it works best on premium grade. Just realize like several other .22’s out there the ammunition will make the difference.

  • cebur19 Feb 10, 2013, 10:55 am

    I haven’t shot my Mosquito much. I do like the feel of it. I think I like it even better than it’s big brother the P226. Many 22’s are finicky about ammo. It’s good that you know what doesn’t shoot well.

  • Alx Feb 10, 2013, 10:08 am

    I must be very lucky then, i have this Mosquito for 3 years now and i have shot about 4 bricks of ammo on it, the only ammo it wouldn’t eat is the Aguila .22lr from Mexico.

    I was shooting with CCIs and a box of Aguila, when i finished shooting the CCIs I started on the Aguila, but i couldn’t get the thing to work, a guy on the firing line offered to help and changed my spring but it’s still a no joy. . . So I gave him the brick and he happily obliged with a box of Remington ammo in return, that didn’t give me any problems either.

  • cebur19 Sep 10, 2012, 8:55 pm

    Sounds like you have a keeper! I mean the wife. She enjoys shooting and helps you fix your pistol. Sounds good to me. About the Mosquito. It is indeed a cool pistol. I have the Sig P226 and the Mosquito. The Mosquito is a cute scaled down P226. I haven’t shot mine all that much. A few quality rounds through it. Mine is just over a year old now. Thanks for your service.

  • Tim Gray Sep 10, 2012, 7:22 pm

    I believe Sig has fixed their FTF and FTE problems. I have read a lot of reviews (none from this year) that stated the need for more expensive ammo (CCI) I have bought two mosquitos in the last two months. The first I took to the range with zero lubricant and shot a box of thunderbolts w/o issue. I then took both guns to the range where my wife shot her new pink one, while I shot the other. She shot Remington thunderbolts while I shot golden boys. After 500+ rounds between the two of us-I had one fail to eject. At her advice my ball point pen removed the round easily and we continued to fire away- mind you the whole time we never put any lubricant on the guns. I am very happy with these guns and I dont have any issues with the slides- I admit I dont know what if any mods Sig has done but these guns are a blast to shoot!