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i recently bought a s&w m&p 40 and would like to be shooting 9mm. i'm looking for multiple 17 round 9mm mags. and if available i'm looking the arredondo mag extensions as well. also, i will need a conversion barrel and might as well plan for the future and make sure it's threaded. let me know what you have and what you want for it and we'll go from there. thanks a lot