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No, i dont believe that you can fit an RIS unit on the TM m4a1 witout modding it. If you buy the M4 RIS it will save you alot of trouble. If you have RIS you can put lazers, lights ect. Sights can be put onto the rail ontop of the reciever. The TM M4RIS also comes with a LAM unit that stores a 8.4v 600mah battery which you may also have to buy if you get a TM M4a1 unless you stick the battery onto the stock.
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