Nugentgl shows us how to install a rail system on the newly released Tokyo Marui M4A1 MWS Gas Blowback Rifle in case you want to change its frontend's look... "Quick overview on fabricating a barrel nut spacer so that you can use any rail system on your brand new TM M4 GBB. Also, go over a couple other things specific to the rail I used as well.

However, I would not attempt this mod if you don't have a bench grinder and dremel as it took me a couple of hours to complete the project with those tools. I can't even imagine how long it would take if all I had was a hand file..."