Listen, here's the deal. The Merc camp needs to be destroyed. We could leave them be, they're good shots... except they've been really asking for it, sneaking into our territory, trying to bribe my people. It's time to teach them a lesson. Can you do it?
― Lukash
When looting, ignore the rifles because you'll be getting new TRs-301s in the Wild Territory or Yantar later on; just take a couple of SUSAT scopes for later because they don't start showing up until you get BACK from Yantar and Lab X-16.
Always liberate the Sniper TRs-301 so that you can transition to it from your Storming Obokan (say) after the shootout at The Barrier later on. The accuracy of it is scary, but the scope has inferior magnification compared to the PSO-1 scope, more like an 'iron sight' with a bead.