Jim, I just use finger nail polish on the threads to keep them tight or you can use blue loc tite, don't use red! Same with the front sight Or if you like you can send it down here to Idaho & give me a couple of years to work out the kinds........just saying! Had a 629 DX once & let a guy from Idaho Falls talk me out of it, haven't spoken to him since! Scoped, that thing would hit a grasshopper at half a block.
