Lazer Tag LTAR Top Sight and NERF Stock mount adapter w/ battery door

LongRange did this first, but there were some issues to address, and it was easier to remix the originals to make the improvements. You can find his WIP here: https://www.thingiverse.com/thing:2955378

Changes that were made to this version from his:
1) Corrected the distance between the stock/sight and battery door components so that it fits on an LTAR properly and so that NERF stocks fit properly.
2) Opened up the hole on the top where the screw post goes due to the installation method (ba