These models are some of my earliest attempts at 3D printing, and as such are lower poly than I’d like. Sorry.
These are designed to replace the orange tips of the Nerf Star Lord Quad Blaster. These barrel tips make the gun more screen-accurate and render the gun incapable of firing Nerf darts. However, they still allow the gun cowling to open and close because I thought that was a really neat functionality of the base Nerf toy. You can use the exact same screws you removed from the original orange tips to affix these replacements. You will have to trim (with a Dremel works best) some of the inside of the barrel cover (the part that moves) away. Each barrel is designed with two 5mm holes to accommodate LEDs. How you go about doing that is up to you, but I’ve discovered the best effects (in my opinion) can be obtained by filling the barrels with clear resin to help diffuse the light fully down the barrel.