My son bought a Laser Ops Pro 2-Pack but oddly the solo attachment for the AR phone game doesn't come bundled (only comes with the single gun pack). Not a problem. I took some measurements and made this snap on design that attaches to the muzzle. It should fit flush, with the feet facing toward the trigger. The phone strap attaches basically the same way as the official part.

No supports needed. Try printing with no bottom or top layers to expose your infil pattern for a nice effect.