I'm working on a rifle build. This one will have an A2 buttstock and I'm curious about the extruded vs. forged receiver extension. Being one to overdo it, I have to go with the forged type but other than Colt, who makes a quality forged tube? I've heard RRA does but thier site doesn't specify whereas specialized armament does specify either for the Colt. You folks have any suggestions? I really appreciate your input.