Zach here. Check the vid below to see a run down on my “go-to” gun, my MK18 Mod 1. Included below will be links to products that I added to this rifle over time to increase the reliability, performance and feel of my airsoft gun to get out of it exactly what I wanted.
For those curious, the batteries I use are 11.1v lithium polymer batteries of varying MAH ratings. The battery fits inside the buffer tube with the rear wiring and connector all in place. The base external build for this gun was a Cybergun Licensed King Arms Colt M4A1.