im not a master of MP5's but apparently ris kits are fairly easy to fit... in the other hand you could tape the flaslight on to save the risk of a regrettable mistake
I used to have the MP5 Navy which had a ris rail on it allready which was quite good. Theres a few different rails to choose from so have a look around.
Also this is my 604th post so I think I beat you there Fate :lol: