PRO SHOT .308 and 7.62 Caliber AR10 Bore guide
The PRO SHOT AR10 .308 and 7.62 Caliber Bore Guide is made with an o-ring that protects the bore throat and keeps cleaning solvent from getting into the trigger mechanism. Always check the bore guide and make sure the o-ring is attached and not in the bore.
The PRO SHOT .308 and 7.62 AR10 Bore Guide is manufactured with delrin. Delrin is a chemical resistant material that will stand up to continual use.