Harris Bipod Adapters - Adapters for rifles without the Sling Swivel Stud #14- For Ruger Mini-14 and Mini-30 standard and ranch rifles#4- Fits barrels from .550 diameter to .812#5- AR-15/M16 without alteration#2- Allows mounting of stud on hollow fore-ends#2R- M14 or M1A Has radiused flange for mounting to wood or polym