upgrading to s-system
 

is it possibly to upgrade a regurlar m4 to the tm s-system m4

Not very easily. They have different bodies.

I think all you need is the foregrip and sights front and back. Its not cheap up here to do it tho. I priced some out at wsc and it was still about 200 if i remember right. Check out a few places. before you buy.

I spose if you just want the look a Casv front end could be what you desire.

The entire front end as well as the upper receiver is different between the standard M4 and the S-System.

It'd be easier to just pick up an SIR to install on your M4. Combine it with an A.R.M.S. Standalone flip up rear sight (or a replica), and you'll have a very close S-System replica that's built better.

I'm currently turning my TM M4A1 into a S-System. Yes, I should have bought the TM S-System in the first place, but I didn't know better. The price difference is almost the same as the S.I.R. handguard anyway.

There is one problem when installing the ICS SIR on a TM M4A1 new type.

There's a metal piece that goes under the barrel near the delta ring to secure the barrel and SIR handguard together. This piece cannot be properly installed because one of the hex screws holding the barrel is in the way. If you remove the screw and install the metal piece anyway, it's not even touching the barrel and therefore not supporting it.

Maybe that piece was is only meant to fit on ICS M4s, or on the older version of the TM M4A1.

Here's the beast:

http://img.photobucket.com/albums/v1...n/m4SIR001.jpg

The only thing missing is the gas tube.