spt/SPT/user/mods/RUAFComeHome/db/bots/loadouts/common/pk.json

{
    "equipment": {},
    "weapons": {},
    "categories": {
        "pkm_barrels": {
            "pkm barrel": {
                "id": "646371faf2404ab67905c8e9",
                "slots": {
                    "mod_muzzle": [
                        "6492efb8cfcf7c89e701abf3",
                        "6492efe46cc7e29a6f03b2a0"
                    ]
                }
            }
        }
    }
}