x2 on the above. Find a reputable gun dealer and drop them off for some "maintenance" (might as well spring for a trigger job on that sluggish 1911 or those night sights.) Another option is to do what a friend of mine does when he goes into Mexico. He leased a storage unit, had a gun safe moved into said unit (a real one... not a tin can Wally World special), and when he is getting ready, he stops by there, drops all his stuff in that safe (which has both a high security key lock and combination), and then goes on his way south.
The only exception is that some guns can be registered with Canada, mainly long guns and longer-barrel handguns. It is a lot of paperwork and has to be done well in advance, but can be done. However, in general, just find a place near the border to stash them.