New JG SIG-552 And G3SG1 Available at RSOV.com. These anticipated releases from Jing Gong are just putting the Chinese airsoft company way ahead of the pack coming from Mainland China. The SIG-552 is a commando version of the SIG 550, shortened 226mm barrel,  and can accept rails and accommodate a various range of optics.  The G3SG1 is a sniper variant of the G3 in used in the German armed forces (SG stands for Scharfschützengewehr or sharp shooting rifle).