Modding Help

I'm trying to make a mod for an AR. But When I add text and stuff to the side of the gun, and Inject it into the game..It doesn't work. Can anyone help or tell me what's wrong?

Make sure you switch it back to a .dtx file before u inject..

Yeah, I converted it to .dtx I know how to do all that, I figured out whats wrong. I was modding the G36C not G36E... Stupid me, Lol