I do like that you've taken the time to put yourself out there, but I do have to say that the rifle's grip (at least some of them) look uncomfortable. This is because of the pipe that is sticking right out where the shooter's palm would usually rest (since these do look like they're meant for human hands). When designing more, it would be good to take into consideration user comfort, how the receiver works, among other things. Since you say this is your first time experimenting with it, I'd say you did a pretty bang-up job, so don't take my criticisms personally.