It's odd that you say that Mk7 because in the tropics, the No4's and 5's, Brens and L1's we saw and dealt with were the subject to the most attrocious conditions that you could ever throw at weapons - and I mean rain and coastal salt water that would start to corrode things before your very eyes. It was dire............ But however the steelwork fared and rusted, the woodwork just took it all in its stride. As I said, once stripped (and stripped of the metalwork), into the linseed hot-tank it went and came out looking good, just asking for more. The same went for L1A1 handguards. You could see the bubbles 'boiling' out of the wood for an hour or so so presumably the air was replaced with the life saving linseed that went in deep. I know it's probably not Morrisons woodwork but I have to say that after that, linseed always held a special place