I'm pretty sure I have a chromed cam pin and a chromed gas key with stainless steel screws. Both new. I may also have a round handguard also for a carbine pencil barrel with a 0.625" diameter hole. Will be about eight or nine days before I can check.
Maybe we can work something up on one of your Colt slabside uppers (like I need another).
Will let you know,
Edited because the pain meds for my kidney stone are really srewing with my tyoing ability...