I wanted to build some spare parts to keep on hand and found some that match from the hardware store.
Bolt Catch roll pin= 3/32X 1/2 Tension Pin Part # 80661
Pistol Grip screw=1/4-28X1/2 part #85073 Socket head/cap screw
this uses #5 external star lock washer
Does anyone know any other matches??

I was thinking about doing the same thing (Damn Gas tube roll pins), for all of the roll pins and "most" of the springs.

http://www.biggerhammer.net/ar15/pins.html has some info, may save some time.

Does anyone know if  detents used for ARs Are made specific for ARs? or are these just generic hardware? (ie: Saftey detent, takedown, piviot, etc,)

What about the springs? (except for the FCG)

subscribing..I'd like to know too..

Pistol Grip screw=1/4-28X1/2 part #85073 Socket head/cap screw

The grip screw is 1"long.