The AR-15/M16 Cleaning Rod Guide is designed specifically for 6.8mm caliber rifles ensuring proper alignment and protection during cleaning operations.AR-15/M16 Cleaning Rod Guide - 6.8mmCompatible with AR-15 and M16 rifle platformsDesigned for 6.8mm caliber firearmsProtects barrel and chamber during cleaningEnsures proper cleaning rod alignmentEssential for maintaining your AR-15 or M16 rifle this rod guide prevents damage to the barrel crown and chamber while ensuring thorough cleaning of your 6.8mm firearm.