Lock-n-Load technology is Legacy's first-in-the-industry system for fast grease reloading. The Lock-n-Load Lever Action Grease Gun lets you reload grease in half the time compared to other grease guns. Just slide the Lock-n-Load switch to disengage or reconnect the barrel. Never worry about crossing threads on your barrel again, and get fast priming every time! This grease gun has a spring loaded handle to facilitate one handed operation. Its handle lock prevents discharge of grease during storage or when working in tight spaces. During use, lock can be stored in the handle. The Lock-n-Load grease gun's handle fully extends to 45 degree, permits use in tight spaces, and achieves 10,000 psi.