Lovely any other suggestions would be appreciated though as it's getting frustrating trying to stay hidden while sniping targets
Buy something from the Trader (not sure if this is necessary or not) but do wait 73 hours (in front of them if you want) and their stock will reset. It may take a few times to get the mix that you want.
At the 188 post, you have to look for the Gun Runner Vendor under the Bridge, not the one on top of it. However I have not had a game where I did not have an oppurtunity to acquire a Silencer. In fact, I have 3 of them right now.
Dont' forget Mick and Ralphs and Sgt Contreras as possible sources for a Silencer.