I've got an older Para P12 that I've given to my Dad, since I became a full fledged Sigophile.  The gun started out plain jane, but I've had all the mim parts replaced, beavertail, trigger/action job, etc...  It's a sweet little 1911, very accurate.  One problem.  The slide stop is worn down and quite out of spec.  With no empty mag in the gun, it won't hold the slide open.  The notch in the slide is slightly beveled out of spec as well, but I'm pretty sure a new slide stop will solve this problem.  So where do I get one??

Brownell's or perhaps the Para Pro Shop, Wilson Combat....etc......