Harris Bipods 5 No. 5 Handguard Adapter Round AR15/M16 Black Steel
Harris No. 5 adapter fits AR-15/M16 standard handguards without alteration, made to fit AR-15 round handguard. Will not fit the old triangular type handguards. Includes perforated flange with a threaded shank, a rectangular washer, a Q.D. stud and a sling swivel