Good idea Crawdad - my 14 bore rifle's hook-breeched barrel has been removed and dunked in colt water for cleaning since it was built in 1986 - probably only 5,000 shots fired in total, but every 30 to 100, it's been removed for cleaning - yet the Express sights are as true today, as they were when it was sighted in, 25 yeas ago. They have not been moved since, yet the 100, 150 and 200 yard sights is dead on- still with the hunting load, and 50, 100 and 150 with the 'squib', target load.