I'd go with the new mr5 over the mrx, mr5 is first strike compatible while mrx is not. I'd go with the mr5 over the tiberius because of price and I don't like how fat the grips on the t8 and t9's are. Also the spyders have higher magazine capacity with stock mags. You can get the extensions for the tiberius mags but they are wicked expensive. I can't speak for tiberius' efficiencies but I used my emr5 yesterday, went through 12 mags and barely touched my 68/3000 bottle
Last edited by sambob117 : 05-19-2013 at 12:19 PM.