Airsoft Yellow Label Man shows his customised Leontac airsoft gun, highlighting upgrades like a Titan electronic trigger, CNC BX, steel stone, and trigger components. They experimented with motors, settling on a 35000 RPM motor. External modifications include a 1-6x scope, a side-mounted sight inspired by John Wick, a tracer unit, and CTR series stock components. The video also touches on internal upgrades and the shooter's preference for using the gun in outdoor fields.