LXG is a personal blast from the past for me.
They were all real guns, the double rifle is a H&H that the armament division of Fox studios (Bapty) bought direct out of the gun trade, I remember they paid about 15k at the time for it.
The Winchester lever actions rifles used by Agent Sawyer and Alain Quartermain were actually Uberti copies bought in from Italy in the white. One rifle was destroyed in the film and the other remains today in Bapty's museum.
I finished the rifles off with the elaborate stocks and fore-arms and the engraving was done by Shaun Banks (of Westley Richards fame). I completed these rifles back in 2002.
http://www.imdb.com/media/rm2546633728/tt0311429Regards
J-PD