Posted by Anti Sin on 3rd Dec 2012
It fit in my old M4 (the battery would go in the handguard, it wasn't a tight fit, which I prefer :)), and it fits in my R36C, but it is a tight fit, but that is what happens if you use anything but a 8.4v in R36C (handguard models). I did a bit of modifacations to make it fit better (cut a piece of plastic to make an easy route for the wire to go through). It should fit in all models where the battery goes in the handguard, but if you want it for a more rare style rifle (let's say a Galil) I would recommend checking to see if it fits before ordering. The battery still works great.
All prices are in USD.