Basically, I have a chance to pick up a LMT MWS complete upper receiver. Now I'm a little confused on what pattern the LMT is. I'm trying to figure out what lower receiver will be compatible as I plan on assembling this myself. I'm thinking they are an armalite AR/10 pattern as they have the slanted back and not a rounded like DPMS. My confusion comes in because AR10, DPMS, and SR25 lowers use different mag patterns. Now because the MWS uses SR25 type mags, it will not work with a Armalite pattern lower because the mags will fit the upper but not the lower?? Help is appreciated. Thanks