Anyone have a source for mailorder, good prices?
Here is the #5 to use with the A2 handguards.
I also found what seems to be a good one for railed forends manufactured by KAC. I just got one and it is very solid. Only down side seems to be the lack of a quick disconnect...it uses a standard straight slot screw like the 300m BUIS.
Midwest was very good to deal with and very fast shipping. FWIW