An old African hand I spoke with about doubles vs bolts did say that a Double is more prone to failure due to dirt grit etc getting in the action and making it hard to close. He was not saying this is a regular thing but one of several things that need to be taken into account if you are looking at buying a double.

Not he was not anti double. It was the only negative/posotive he mentioned that I had not heard of or considered before.

Wouldn't mind a double but I am certainly more comfortable at this time with a bolt.