I have a height adjustable laser pointer attachment for my Nerf Infinus. I have a version with the battery pack or a power bank. There is a switch on the battery pack to turn the laser pointer on and off. I soldered a small switch to the power bank or you simply pull the plug. I had to bridge some distance on the holder, so you can store an extra arrow. For the laser pointer you need a thin nail (2 mm diameter, 25 mm long) and an M3x30 screw with an M3 nut.

Please be careful not to blind anyone and have fun!

Laserpointer https://www.amazon.de/gp/product/B08N1F4P5Z/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Powerbank https://www.amazon.de/gp/product/B08VRL66HZ/ref=ppx_yo_dt_b_asin_image_o00_s00?ie=UTF8&psc=1