My dad and I are building those .50's and we were wondering about barrels and optics. Any advice on either one? Dad's thinking to go with a suplus M2 barrel till we know it works, to which I was tempted to reply simply "Well since you built the thing..." but decided I might not get to shoot it if I did and kept my yap shut. I know a guy who did so I know they're out there, but where do I find such strange and wonderful things? Shotgun news probably... Optics? We're pretty satisfied with my Reflex, but I don't think that's a good match. Besides, if we take that off my AR, what will I chase down rabbits and the neighbor's dog with? I'm thinking something with a high magnification to get me as far away from that damn drum as possible. You know, I might just have someone else pull the trigger on that and watch from a circling plane. :? For those who don't know, I made a comment in another discussion about shooting a gasoline filled 55 gallon barrel with and incediary .50 BMG round. Yes, I know... crazy punk kids.