I had the same issue with the 3-4 guys on the truck. After kiling them and getting no cutscene, I took the dirtbike to the base. I received the "leaving mission area" warning but just kept going. When I got to the base, I scored a headshot on the first enemy I saw and presto uniform cutscene starts and I am back at the house with the invisible gun.
My problem now is, I have killed everyone at the base and the town after he destroyed the radio tower, but I am not getting the next cutscene. Any suggestions?
