Unlocks after completing the quest .

Buy an “Ushanka ear flap hat” at the Flea Market, and a scav vest (or barter it with Jaeger), and an mp series shotgun from Jaeger. Only kills with MP shotguns will be counted and only while you wear Ushanka and a scav vest.

The Scav vest is best bartered at the Jaeger for a Snickers bar. Or buy at a flea market.

Trader	Items		Result item
Trader		Items	Slickers		Result item	Scav Vest

It is recommended to take the armor that is available to you and modify the MP-153 (Sight and muzzle brake. It does not make much sense to change a stock). 
For the MP-153, it is best to take advantage of the offer of a Jaeger or barter with a Skier at the 2nd level

Trader	Items		Result item
Trader		Items	Yotota Car Shestyorka		Result item	MP-153 Restriction: 2 items Count: 4992 items

Class 3 armor can be purchased from a Peacekeeper (level 2) or from a Ragman (level 1).
For a Peacekeeper, it will cost $ 300 and for a Ragman, it is a barter for 2 cans of energy. It costs about 20,000 rubles

Price

trader	item	Price
trader		item	MF-UN	Price	400 $

Trader	Items		Result item
Trader		Items	MaxEnergy x2		Result item	MF-UN Restriction: 1 items Count: 1565 items

The best ammos (Punch up to and including the fourth class). If they are not there, then charge them with whatever you can. At level 18, you should have a flea market available and there you can buy or . It is the bullets to penetrate the armor. Well, if there is no way, then take a fraction with the hope of hitting the head.
Don't forget to load your shotgun before or at the beginning of the raid.

Go to Customs, try to get to the dormitories fast, and hide in rooms, for example, opposite of marked room or opposite to any quest room that opens with a key.

Try to meet people at close distances, hide in such a way that they won’t expect you, go behind them and feel free to shoot them in the back. 

Naturally, if you see poorly equipped PMCs, then you should play more aggressively.