If you aren’t up for building a prop from scratch, you can always try for the modification route. Redditor Jimsbeanz did that for a Halo assault rifle. BoomCo makes a replica of the weapon for the game, and though the colors aren’t quite a screen accurate match, the gun can be painted over. Jimsbeanz gave it a complete makeover with a Halo palette and went above and beyond to add a working ammo counter. You can see the ammo counter in action over at Imgur.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.