I've found this 20" model 1 that fits the bill almost exactly but I'd like to compare it against another build. I'm also aware that maparts sells .22 uppers but I think they have the cmmg m4 style .22 uppers. I'd like to go with a bull barrel varmint upper. Does delton carry that sort of thing? I checked their website but I didn't see anything of the sort. Suggestions welcome.