Why doesnt someone make this? would it be possible to trim down a .223 brass and expand it to take a 358 boolit? then make an ar upper for it? Brass would be pretty cheap, and you would have balistics similar to a rossi 92 in .357. This idea has probably been thought of but it just dawned on me after reading about the .300 black out. The reasons i would have the .358 over the .300 blackout are: not having to lube cases, i have lots of .358 molds, case life would probablly be longer than the .300 black formed cases and 9mm suppresors are cheaper. What do you guys think?