Ar18/ar180 to Ar18 ?

Can confirm.

AR180 upper drops right on a AR180B lower. You just have to use the AR180B guide rod. Not sure if the new aluminum offerings are compatible with the two stud locking like the original AR18/180.

Can't see why AR18 wouldn't also work.
 
Apparently this is the only picture I have confirming its possible.

pybYIF2.jpg
 
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