The most common and easiest to identify changes have been detailed
#Colt 1911 a1 45 caliber serial number
Barrels: All variations and serial number ranges of the military 1911/1911A1 pistol used specifically marked and identifiable parts. I haven’t tried either, but knowing how my long ass fingers feel on most plastic pistols I think I’d like the long 1911 trigger. Never any problems with it, or with my RIA.