New way if doing things! - Fortis Manufacturing AR-15 LE Locking Lever Castle Nut/End Plate K2 System

K1 is tapered castle nut version and K2 is lever lock version. Both are fantastic and negate the necessity for staking castle nuts and allow for easier removal when necessary. Make sure you torque correctly and they will serve you indefinitely. Additionally they are ultra lightweight. Functionality between K1 & K2 are horse a piece although I prefer the K1 because I feel there is less likelihood of the lever failing, yet this is not supported by anything other than my personal option. Fortiss customer service is excellent and products are all top notch. Bonus, Optics Planet is an excellent company on all levels!