Want to Sell Chinese Spiker Set, Chinese Gas Tube, Chinese Polytech Slant Brake, Arsenal Krinkov Hg's, Combloc Market Stickers

Are the Arsenal handguards stamped or milled?

According to Arsenal both for the ribbed;

Ribbed Krinkov handguard sets for stamped or milled receivers.

www.arsenalinc.com

The smooth top HG's are stamped.