Sad to hear. How bad are the deacts if I may ask?
Not sure what you mean, 'how bad'?
If you mean, what is done to de-act them, then it depends on when it was done.
In the UK, before 1988, there was very little that needed to be done, but the rules were changed and made more detailed in 1988, as well as having to be proof stamped with a certificate of deactivation.
For bolt action rifle, between 1988 and 2016-ish, the barrel had to be saw cut along at least a third of its length, and a metal rod welded inside, and a steel pin drilled through the chamber and welded in. The firing pin had to be removed and the bolt face had to be saw cut at a 45 deg angle across the width of the bolt. At least you could still virtually field strip and the actions still worked. For a semi-auto or full auto any gas pistons etc had to be removed as well. Semi-auto's and full auto specs were further tightened in the UK in 1995, with some welding up of actions to prevent field stripping and cocking.
Since then though the dreaded EU got its knickers in a twist after the Paris attacks, and instead of just adopting the UK de-act rules which were the most comprehensive in the EU, it went way further and totally lost the plot, and now everything has to be welded up so no working actions, no stripping. Old spec guns, can't now be sold or traded, they have to be re-submitted and further cut/welded up to the current regs to be able to be sold or traded.