Koretac Airsoft a stock Specna Arms SA-A34 airsoft rifle for use. He first shows the initial performance of the rifle before disassembling it to access and replace the internal components. After cleaning and reassembling the gearbox with new parts like a new gear set and motor, he puts the rifle back together, adding a new suppressor, foregrip, and red dot sight. He then demonstrates the upgraded rifle's performance, which now fires at 1.6 joules and has a rate of fire of around 20 rounds per second.

Koretac Airsoft turns a Classic Army M4A1 AEG into a BB spitting monster... "Welcome back everyone! Today's build is a Classic Army M4A1 that's come into my workshop because of FPS issues. It turned out to be a pretty easy fix and I took the opportunity to upgrade the airsoft gun while I had it open.