Hey guys, could use your expertise. Stumbled upon this ( https://www.gunbroker.com/item/858636030 ) krink kit and I noticed some things were kind of off, at least to my understanding. First, the gas tube doesn't have a serial on the left side, and it's attached to the US made arsenal ribbed HGs. Seller claims they're bulgy mil HGs, but I've never seen any that look like that. Second, the front trunnion markings look different from most ((10)) markings I've seen. I'm not saying this guy is a scam or anything. I've purchased from him before, and I know many of you have as well. Just kind of curious. Thanks!