I tried all kinds of parts combos, my favorite in the end was a glock 22 with an STI magwell I did some 'custom fitting' for, a wolff springs steel guide rod, wolff springs 14# recoil springs, arredondo extended baseplates for the mags, and a wolff springs trigger kit. I also polished all of the internal surfaces including rails, slide interior, barrel, and trigger parts using a dremel and very fine grit lapping compound. Overall this setup worked very well for me and I never had any reliability issues whatsoever.