The upper and lower are basically the only things left from the stock rifle. Schmeisser AR-9. If you intend to build your own, aero epc-9 is a good basis
Insta360 Go 2 Very lightweight and mounts to a cap easily. The current version(go 3) offers a bit better resolution and battery lifetime but for comp shooting the go 2 is fine. Also the go 2 case is more robust since it does not have a display.
