ALG Defense ALG Defense, Spring, Stainless, AK High Energy Main Spring 04-233-F The ALG High Energy Mainspring is a performance replacement spring for the AK47/74 platform rifles. It is a Chrome Silicon single wire spring fabricated per ASTM A401 specifications. The ALG High Energy Mainspring develops 25% more torque over a standard factory main spring" lowering lock time and also increasing the consistency of primer ignition.