Ok I’m getting into longer range shooting with the 556. I’m using an 18” Ballistic Advantage SPR barrel in 223W and recently shot the IMI 77gr SMK HP Razor Core and was pleasantly surprised of the results at 600yds. Then I came across the IMI OTM Mod-1. It’s in a different bx looks the same but I can’t tell nor can I find the difference between the 2. If you have info or shot them both feel free to let me know your findings. I’m curious if they are in fact the same and just packaged differently.