Good choice on the STI.I didn’t see this early enough to chime in, but I have a Trojan in 9mm for 3 or 4 years now and it sees at least 3000 rounds per year, sometimes more. So far this year I am at 2000 already, so it’s going to be a good year.
Since I’ve had it the only things I did was change the springs. I have an 11 pound recoil spring and a reduced pressure sear spring, I think from Wolff but it might be Wilson. I have some Metal Form mags that it came with and I practice with and they run pretty smoothly. Wilson’s for matches and I have no problems. I can’t make the gun jam if I try, any ammo I put into it feeds every time round nose, flat point, hollow point, seated long, seated short, they all slam home. Only problem I have is with two of the Metal Forms that they have a tendency to spit an extra round out when ejecting, so I’ll get the empty case and a live round flung out, but it doesn’t jam. But I know that is a magazine related issue as well.
I don’t remember what the Spartan has, but I prefer the stippled front strap over checkered.