Where can I find the hs 36?

you can find it later in the campaign (i assume you mean campaign) on some dead clawhammer dudes or in some of the weapon stockpiles. i think i remember one being on a crate on the 1st floor of razad's HQ, but i'm not sure. they're around!

Do the custom mission 'Turning Point.' Whatever weapons you have at the end of the mission, provided you are successful, will be added to your inventory. You can get a lot of weapons by running through the custom missions. There are a few that you can only get from the campaign but overall you can build a sizeable inventory just running around on your own. Just going down the list, in the custom camp. you can get: PDW-46, F90, IAR 556, AK-102, M4A1, ATAC 2000, HS-36, FAL, FDO-11, M3T, M200, SASR, Mk 20, F-Edje MSR, ISR-N56, RTK-74, AMELI, PKP. You get everything else doing the main story. If you play a lot of coop, in the event that Sony ever gets their sh*t together and fixes PSN, you're def. going to want to have a good assortment of MOD 5 weapons. I've been working on the weapons non stop ever since Sony screwed the pooch and killed any hope of ever successfully launching a PS4.

Co-op is an excellent place to get the majority of the weapons.Campaign is required for the C-9mm.Any weapon other than elite weapons can be kept provided you complete the map.Good luck!