Helmet: Custom Cast Part
Head: Dollar Tree "Final Faction" Sergeant Steadfast Figure
The Rest: Marauders Task Force Parts

I'll be the first to admit my custom doesn't look much like the V1 S.A.W. Viper. The helmet is the later, modern interpretation. The colors aren't accurate. The head isn't quite right (it's the only head I had small enough to fit the helmet). So...I get it.
I've been trying to build a S.A.W. Viper for some time and each time I try, I just can't get it right. I can't get it to look like the original S.A.W. Viper. I can get my customs to look closer to the Collector's Club version or the 50th Anniversary version. This is honestly the best I could do with the parts I had available. And to be quite honest, I'm not prepared to spend anymore money to try to make it look better.