CatgutViolin shows his airsoft Diemaco LSW which he used a Viper Tech M16 Gas Blowback for this project... "Yeah, I got another Vipertech. This has been a 'grail gun' of mine for a while and, to my knowledge, hasn't been replicated before in airsoft. It's conceptually and functionally similar to the GHK AUG LMG, so wasn't too tough to build."