I own a Springfield 1911A1 that was factory built for 45 Super. I haven't fired 45 Super in it for probably 4 years now ... and it's been heavily customized by John Harrison for shooting 45 ACP. However the best I can remember the factory installed a 22 pound recoil spring, oversized firing pin (to prevent primer puncture), super-duty extractor, tuned ejector and wrap-around rubber grips (to help keep the damn thing from jumping out of your hands).Shooting 45 super in a Colt..........what's involved!
If there is such thing as an ideal gun for 45 Super it's the HK USP. They're literally upgradable to 45 Super standards by simply changing the recoil spring.P.S. I think the only gun you could shoot .45 super in is a 1911, Glocks won't even support +P ammo in their .45s!