Hello I have a JG M4 S-System 2010 upgraded version. Im going to get a tracer unit but Im not sure how to put it on. These are pictures of the gun:

http://www.amazon.com/S-System-Airsoft-Rifle-Upgraded-Version/dp/B0031VXG4C/ref=sr_1_1?ie=UTF8&qid=1320432698&sr=8-1