How bout a 5.45 upper to run w/a RLL? Got a few ques, Do they use the same bolt and carrier as 5.56? How bout mags, I have heard they work in GI mags but not that good. Are there special mags for5.45? How bout Pmags? Model 1 has 11.5 uppers w/a 1;8 twist anyone have exp w/them? With surplus ammo how would you say they compare(accuracy wise) to a 11.5 5.56 w/ 1;7 twist? What about that corosive residue in the gas tube, wont it be a bitch to get out? I shooy it in my AKs but I can put my finger in that gas tube. How bad you rekon the laquer coated surplus ammo will gum up a AR blastin full auto? ANY INFO IS VERY MUCH APP! ALSO IF YOU GOT GOOD SORCE FOR PARTS,MAGS ECT THROW ME A BONE. THANKS!!!!