I'm going for specific look. Most likely 12.5 barrel in 15 handguard which would make a kx5 just about flush. The instructions with it say hand tight against crush washer then wrench no more than 1 1/4 turns until writing is level. My question is can I thread on a nut then crush then flash hider if I want a certain portion of hider to protrude from handguard? Will this affect anything at all? Pig is in the mail and I've never installed before but I'm assuming I can shim it out further on threads if I wanted to?