I have some leaky mags for my SRC AKS-74U GBBR. I proceded to open them up to check for dry/cracked o-rings. All the fill valve o-rings are good but when I opened the top up I found not bad rings but damaged castings.
All three of them are like this!!! It apears when SRC assembles these things the machine nicks the seat for the top o-ring.:banghead:
What is the best way to fix this?