>>64126905
It's a Detonic's Combat Master.
https://youtu.be/ebzv1T-mBHA

First
>1911 with a bull barrel
>1911 with a barrel shorter than 4.25 (predates the Colt Officer model by a decade)
>1911 with a reverse plug
>1911 with a captive recoil spring
>1911 with a dual spring set up, think it was one of the first guns to have multiple spings (Glock 26/30 would later have very similar recoil assembly set ups)
>1911 with a flat top (maybe someone else did it first)