So this is what the inside of the Ma40 ammo counter looks like. It has a Faux Ammo counter that goes inside of a "window" plenty of mod capabilities. : r/Nerf
Update on the ma40 repaint and mod I have just added the ammo counter : r/ Nerf
Prototype NERF MA40 Mag concept | Halo Costume and Prop Maker Community - 405th
Is This Mod the Most Advanced Nerf Gun on Earth? - Nerdist
Nerf Ammo Counter - Etsy
REVIEW] NERF Ammo Counter MK4 (THE BEST NERF AMMO COUNTER YET!) - YouTube
Nerf Gun Ammo Counter And Range Finder | Hackaday
Nerf Ammo Counter - Etsy
Is This Mod the Most Advanced Nerf Gun on Earth? - Nerdist
Review: Integrated Ammo Counter Into Nerf Cam - YouTube
Maker mods his NERF blaster into a fully-functional Halo 5 MA5D | Atmel | Bits & Pieces
Ammo Counter: The Ultimate Simple & Cheap Guide - Modifications - NerfHaven