Help. I keep getting 'required' alert I need Max 2 Tier. Yet I'm using a almost fully functional ..

The update fixed this loophole- using a higher tier weapon than the actual level needs. I grabbed a tier 6 weapon right off the bat and breezed through everything then bought a tier 12, when I updated it wouldn't let me use the better weapons, you have to basically use the right tier weapon and do missions to buy the upgrades

No. It's not right. I used full loaded weapon but error showing max tier.

What is the max tier...and how i understand which sniper is max tier 3 or 2