Awesome Job, very well done. Showing the good with the bad and corrections you have made is very encouraging to other builders. I guess if I ever go R1 I know who to contact
As to the gun, do you want electronics in/on it? If you think you will troop a lot, maybe something like a rubber gun so no need to worry about dropping it.
You saw my E-11, I have the hyperfirm T-19 that I will be modifying for electronics to get the best of both worlds.