I have an Adcor B.E.A.R. Elite and I'm having some issues. when shooting 5.56 (Fed. M855) with the gas setting in the 5.56 position the round will fire and the bolt will cycle ejecting the spent cartridge and go back into battery but it wont strip the next round from the mag. when i set the gas system to .223 it will cycle and load the next round just fine (still shooting 5.56) today I tried shooting some .223 (PMC i believe) and the gun would fire, eject casing and go back into battery without loading the next round no matter what setting the gas system was on. If it matters I am using Magpul gen 3 PMAGS. any help would be great.