SERPENT5XX - Good info, thanks for the pics. Unfortunately I have to wait a while to jump on the bandwagon. (My truck is costing me $2200 for a mechanical fix so I won't have any allowance for a while.) I did pick up a PRI "Gasbuster" charging handle for the SPR upper I'm getting built yesterday. Now it'll have to sit in the safe until I can afford the scope. !Asi es la vida!
Peregrino