Made of 7075 t6 aluminum and finished in type III hardcoat anodize, our Rear ARCA Rail Mount ties into our 4th Generation NSR barrel nut for custom fit to Noveske guns to give maximum rigidity and minimize unwanted leverage into the handguard. downward facing QD for long range sling setup. RRS R-lock rear stops. The Arca mounting solution started in the photography world and quickly PRS, Hunters, and long distance shooters jumped in both feet. With the benefits of it’s adjustability, rigidness and quickness, you can see why it’s become the standard.