I have a Sig Trailside with a 4.5" barrel. It does not have adjustable sights. I bought it used but in excellent condition (for less than 300 bucks). I love anything Hammerli, and frankly this one is a great deal. There are a few provisos, however. It is ammunition sensitive. You will have to experiment with the type of ammo that works best in your pistol. Mine doesn't like to cycle Federal 711Bs, for instance-it needs something hotter. No big deal, but don't be frustrated with it- try different kinds of ammo. There are at least two generations of magazines out there. It has been a while since I examined them, but I remember something about there being a slit up at the top of the magazine that signified the newer style(?).
If you are looking at a new one then ignore this. Now to particulars. Excellent accuracy and trigger pull. What a trigger pull should be! Crisp and light. Larry's Guns in Maine even works on Trailsides if you want to improve on it.
As I mentioned my Trailside had fixed sights and this was a problem. It has been said that there are different height rear sights available in order to sight the pistol in but don't believe them. The factory said this but they don't exist. The problem is the rear sight is made of plastic, and it got knocked loose- you can move it with your fingers! Larry's guns sells adjustable units. They are made by LPA of Italy. If you get the adjustable sight version from the factory this is a non issue. When I installed the adjustable sight it hung about 3/8" off the back of the rear of the slide. The dovetail fit without a problem, but cosmetically it looks like hell. Still, I love the accuracy of it.
I use my Trailside as a trail gun (imagine that!) and it is great for it. Unfortunately, there are a few more flies in the ointment to describe. The grips are honking big for their purpose. They fit, sure, but this little gem screams for some nice slim walnut, not goofy ass plastic. I haven't found a source for this, and believe me I have tried, so it is time to make it myself.
If you wish to compete with the pistol, well, I think there may be better choices out there. The reason I say this is small details. You can get Nill grips for the Trailside, but the front sight is integral with the barrel. This limits you and frankly when it comes to competition I want options. Consider a Pardini instead if competition is your game. A used Pardini won't break the bank and they deliver.
Back to the mags- they are easy to load. Yes. Easy to load. I wish I could say that about every other .22 autoloader I have ever had. Small details like that add up in my mind. I like where the mag release is. Like the 1911, in other words, where it BELONGS. The slide release works and it is easy to operate too.
All in all, I like it a lot.
Hope this helps a bit,
Cheese