FX BARREL ATTACHMENT & LINER LOCK SET MODEL .30 / 7.62CAL

X Barrel Attachment and Liner Lock Set By Huma-Air. 7.62MM / .30 CAL This barrel attachment and liner lock set allowes you to exchange the caliber of your FX rifle when you already have a matching transferport and probe for the specific caliber. The liner support o-rings are included, just like the internal and external o-rings for the attachment and liner lock