Excellent addition - POF USA Roller Cam Pin AR15 .223 RCPA223

I purchased to replace the standard cam pin with my Adams Arms piston upper. I think this is probably most beneficial as an addition to pistons, but it looks like they also have kit for DI guns. Reduces the gouging you get with the square head type that is especially common and more pronounced with pistons. Also because of the coatings it requires less lube to run smoothly. For $25 its a nice addition to your gun, but I'd honestly give it 5 stars if it were priced around $15.