>>64217979
Wilson Combat has some stuff, ignore their "action tune" as Ernest Langdon WORKED for Wilson Combat to develop that stuff, his LTT stuff is the evolution of it. Ernest Langdon also worked for Beretta USA for a long time (also shot for Team Beretta), working from a customer service phone agent to the head of law enforcement sales. Wilson has a nice rear sight (Wilson Battlesight) but apparently they had a competition shooter (Les Pep or whatever) design it and then never credited the guy for designing it.

LOK grips. VZ grips.

Volkers Precision has some stuff, same thing about their flat face trigger, I heard a rumor they stole the design from some guy.

Black Beard Customs has some stuff.

Jarvis obviously makes barrels and compensators

Barsto makes some very nice match barrels