AK Silver: 6900 BP at BP Item Mall on website(BP is obtained for 10% of the ZP you earn, so 69,000 ZP = 6900BP)
AK-47 Camo: GP Crates, or coupons.
AWM-Camo: Coupons
AWM-Red Dragon: ZP Crates or Coupons
BC-Axe: Coupons
D-Eagle Camo: GP Crates or Coupons
Field Shovel: Not permanent, only available through ZP Item Mall in-game or on site for 2,300 ZP for 7 Days and so on...
Golden Desert Eagle: Coupons
Golden M4A1: Coupons
Kriss Super V: ZP Crates
M4A1 Adv: Cannot be permanent, either available through coupons for a certain amount of days, or in the ZP Item Mall. Can be in Crates.
SG552: ZP Item Mall, not permanent. Can be in crates.