08-26-2012, 06:52 PM
Has anyone had problems using Hahn risers? I just had to retire my Vltor upper because the set screws in the riser started to puss through the low points in the rail on the upper and make contact with charging handle. Vltor says they will NOT warranty this because it is, "not what the upper was intended for." Good news though, I'm building a plinker and the Vltor unit will look nice on it. Just got a Mega heavy duty billet upper yesterday and screwed everything together. As I type I've got cases in the tumbler for next month! The only problem is I've got Speers loading manual #14 and they don't have any loading data for the Grendel 
. Anyone have a chart they'd like to share? Or some input? 
. Anyone have a chart they'd like to share? Or some input?