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I have the model with the fixed, pistol grip, buttstock, and the removable chokes. I don't have the specific model number with me. Thanks for the mag extension info... Dennis

Hello all, I recently bought an M4 and have a couple of questions. 1. Where can I buy the magazine extension tube? 2. The Benelli web site describes that the M4 is designed to use reduce shot loads - is it okay to use standard shot loads without damaging it? I'm interested in all of the fun accessories for it too ... Thanks for the feedback Dennis