just want a bit of info here,a lad at work grandfather has just died he was the owner of a shotgun that he had de-commissioned few years ago,the lad wants to sell it,not sure of make/model but he thinks from looking at it although he admits that hes not sure by any means,but it seems the barrels have been filled with lead,is this what they do?if not what is the process and can it be reversed without the gun neading new parts bought for it ie would the trigger mechanism be intact for example,im kind of guessing not as surely the point is that it can never be used again ,any info would be great