Uh, sure. Not entirely certain what that will do though as the entry is basically the same as for the ammo pouches in the most recent version.
{
"type": "ARMOR",
"id": "legpouch_large",
"name": "leg ammo pouch",
"name_plural": "leg ammo pouches",
"description": "A fabric ammo pouch that can be strapped to your leg and is capable of holding up to 4 magazines close at hand.",
"weight": 120,
"volume": 1,
"price": 2000,
"rigid": false,
"material": "cotton",
"symbol": "[",
"color": "dark_gray",
"covers": ["LEG_EITHER"],
"coverage" : 15,
"material_thickness": 2,
"use_action": {
"type": "holster",
"holster_prompt": "Stash ammo",
"holster_msg": "You stash your %s.",
"max_volume": 6,
"min_volume": 1,
"multi": 4,
"draw_cost": 5,
"flags": [ "MAG_COMPACT", "MAG_BULKY" ]
},
"flags": ["WATER_FRIENDLY", "BELTED"]
}