I am presuming that the gun in question is a two piece stock. I have taken down both Darne and Charlin doubles with one piece stocks and it was a simple job. The only thing to watch is losing the balls out of a Charlin. I ended up buying a box of 100 stainless ball bearings of the proper metric size from Fastenal. (5mm is what sticks in my mind.) The guns will work without them but they lose that buttery smooth operation. I secretly believe that the people who say they see no difference in action between the two makers may simply have tried a Charlin with no balls (pun intended).