A co-worker's girlfriend works a a pawnshop and recently a girl came in with several boxes of ammo to sell including two boxes of the aforementioned ammo which my friend's girlfriend bought since she has a GP 100. We were shooting yesterday and he asked if I had any idea as to why the primers had a red sealant that left a heavy deposit on the frame after shooting. I said I did not know and he speculated the possibility of it not being a sealant but as a 'marking' compound that identified the gun it was shot in. Anyone have any knowledge of this ammo? Maybe just an obnoxious red sealant but he mentioned he has shot ammo that has primer sealant (as have I) but he said he never encountered it leaving a deposit such as this ammo does. It is marked very clearly across the front of the box 'For Law Enforcement Only'