It looks like the older design SIG airsoft rifles are coming back in style too. In this video ASTKilo23 talks about his upgraded Tokyo Marui SIG 551 AEG. Find out what he did to it including the upgrade parts he used... "Just finished work on my TM Sig 551. You may not agree that it is a TM gun now, but it started that way, and I prefer to think that it still is."