Last year I was debating, and posted about, a Kentucky (style) rifle or perhaps a GM drop in barrel for my TC Hawken; I've also been considering a Lyman GPR for 2 years or so based mostly on everything I've read about them & had one in my cart at Cabela's a few times. Just never pulled the trigger, so to speak.

Well, last week I came upon a NOS 1979 Lyman GPR caplock .50 for sale... Today it was delivered by FedEX-a time capsule in it's original box.

For fear of jinxing it, I hesitated to make mention earlier but I've been researching the how-to's of a new gun; what about a new-old gun?

Looking at the barrel's (browned) exterior the packing gease is certainly dry-I have to imagine the same for the bore.
My plan was to use brake cleaner, as per my research, to remove the dried factory grease(?). Follow that up w/ Hoppes #9, then hot water & soap.
Truthfully, I've never owned a new gun before so this is an odd situation & any help is greatly appreciated.

I really cannot wait to shoot!