TM M4 RIS metal receiver
this has probably been asked before many many times, but I just want to be sure so that I don't go and waste some money. is there any specific make of metal receiver that won't fit a TM M4 ris? I want to be sure I buy something that will actually fit my rifle, and not sure if there is any variation between a regular M4 and M4 RIS in terms of the receiver itself. any help would be well appreciated.
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