The way I look at it, if there was a lot of problems, and the owner was answering the phone, he would deal with the problems so that the phone would stop ringing.
You will probably not have a chance against a slicked up '92. The Big Boy is... BIG. It locks up solid, and when you work the lever, you know that there is some meat in the breech.
That being said, the receiver, which is a hardened brass alloy, tends to have some natural lubricating properties that steel on steel wont have. It is smooth right out of the box. There ain't any aftermarket slick-up kits made for it that I know of, so there is little reason to mess with it yourself. Just take it out of the box and shoot it. If you have any issues with it, you don't have to pay anyone to fix it... the factory stands behind their product 100%.
BTW mine is in 45 LC, and I shoot BP only it it. I had some feeding issues when I got it. one out of every 4 or 5 cartridges would hand up coming out of the magazine tube and only come out about 1/8 of an inch or so. Turns out the shell carrier was made wrong. They replaced it and now it feeds 100%.
I have several other lever guns... a 45.70 Marlin, a 357 Marlin, and a .30-30 Winchester. When I am loading the Big Boy, I really don't miss having to force each shell into the tube against spring tension. There are those that seem afraid that dropping the cartridges down the magazine tube from the front might cause a high primer to go off. I guess it certainly could happen. I just lay the gun down horizontally on the table with the muzzle pointed down range and slip them in one at a time.
If you have ever taken apart a modern large framed Marlin lever gun, you will find that there is a lot of similarities between the Marlin and the Big Boy. The gun works well. It may never be the fastest gun out there, but it is one of the strongest. It is also made in the USA with a no BS warranty, which is kinda nice.
Rick