Search:

Unfortunately the 75 A-Max loaded to mag length in the AR isn't a good mix due to the ogive being inside the case. You will have to either single load (drop them throug the ejection port on the mag...

Also to clarify there are ".22LR conversion kits" (which replace the bolt carrier group and allow you to fire .22LR through the .223 upper), ".22LR dedicated uppers". The conversion kits are cheaper...