IWC Universal Light Mount, works for Surefire scout lights as well as Picatinny mount lights (like X300). Attaches via backer nuts to handguards like DD MFR, Troy, MI, etc. Pre-Keymod or MLOK. Bought it a month ago and decided to go a different direction with this upper. $25
Universal Sling QD socket - $25
Universal Sling QD socket - $25