1.Take AK with wooden hanguard to your inventory
2.Put your wooden hanguard down from weapon.
3.Put Rail Hanguard to your AK in your inventory.
4.Put attachments like Bipod or WEapon Flaslight on your AK.
5.Double click on Rail hangurd with no item in your hands.
6.You will put your Rail Hanguard down from your AK.
7.then you can put your wooden hanguard back to your AK.

Finished : You can play with those attachments on wooden hanguard , and you can use your Rail Hanguard on other weapons.....
FIXED : After relog will your bipod / flaslight dismiss from your weapon..
but you can put bipod back to your inventory, and thne bug back if u relog back to the server... bipod will still worked so i mean you need to fix it :) Thnaks