metal super safety's, will last forever functions similarly to an FRT. they enable your firearm to shoot quick, all fully legal. i have 2 options one is 3d printed stainless (40$) and the other is 4140 steel with a hardened coating (60$) . comparable super safeties online are going for 80-120$. link to super safety firing here https://www.reddit.com/r/Guns_Guns_Guns/comments/1k4o6u2/super_safety_in_action/