Faxxon 18" barrel is in, need recommendations to finish setup

[R2BRO]

0.75oz vs 1.2oz but this second one which is 1.2oz is just $8.5
https://www.wingtactical.com/firearm-par...arrel-nut/

i have one little concern... i got a long 15" rail there, and my old barrel nut is kinda long and big. i wonder if the styles of the barrel nut i shown above would even work with it then?