Airsoft Designs shows how to put together the RK-1L. This is a spring-powered airsoft grenade designed to be loaded with BBs and actuated on impact. It uses a standard AEG spring, tested with an M120, and features two separate chambers, each capable of holding up to 140 BBs, though a load of around 80 BBs per chamber is recommended for reliable performance. A side-mounted adjustment screw allows users to tune the impact sensitivity to their preference.