The "failures of Sig Trailsides" is grossly over exaggerated. I have had mine since they were first released. Initially some had problem with the trigger guard breaking. The word was that the trigger guard was cast aluminum and totally inadequate. Several people who report here had extensive mods they claimed fixed the problem. To be sure mine did not fail I investigated.
What I found was the trigger guard was probably cast but of steel (magnets don't lie). The problem was that a vertical protrusion on the trigger guard was the stop for the slide in recoil. The manufacturing process for the trigger guard left a small flashing or seam on the front of the guard that kept it from seating in the rear against the frame which was the support for the guard's recoil stop. The flashing could hold the guard off the frame just enough that the recoil over time could break off the recoil protrusion on the guard. The fix was literally a few passes of a file on the flashing until the guard firmly seated against the frame and all was good.
The gun is good as a less expensive almost clone of the Hammerli 208 (I think that is the model?). It is not an exact clone but close. It is too light for me so I added a red dot. I could not get the longer barrel version I wanted and had to settle for the short barrel. It uses plastic mags but I have not had any trouble with them. The gun is accurate with target ammo like CCI Standard Velocity. I have not had any feeding or extraction/ejection problem nor have I heard of any.
The current production Hammerli Xesse is the Trailside with a few modifications (??):
The trigger of the Trailside is adjustable (not covered in the original instruction manual) and can be adjusted to be an excellent European two stage trigger.
The Sig Trailside is under rated, suffered an undue bad reputation, and actually is a good target gun. There is no reason to baby it if you fix the trigger guard so that the frame at the rear of the trigger guard limits the travel of of the guard back into the gun instead of the flashing on the horizontal surface in the front of the guard. Once that is done the guard is fully supported in recoil and will NOT break as it is just a supported spacer.