Steve I believe it's currently being "serviced" by Hammerli, from a recent thread. I hate to bring up the "Mosquito", but I believe it's another situation where Sig was selling another companies creation to "Round Out" their line, including a .22 Rim Fire. If I'm not mistaken, I believe the "Mosquito" was its "replacement" in the Sig "lineup"!
I don't think I would compare the Trailside to the Mosquito. The Trailside is being serviced by Hammerli because it was made by Hammerli. I personally have not owned one, but everyone I know who does thinks they are very well-made and accurate. I believe the Trailside is an economy version of the Hammerli X-esse target gun.
I own a couple. It is in NO WAY comparable to the Mosquito. It is a finely made (and balanced) gun with a very nice trigger. It is very accurate and is a smooth shooter. It is not picky about feeding ...but if you are looking for a target gun you will need to try as many brands as you can get to find the one that it likes best.
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