You could contact Nick and see if he has some more stocks to sell:
http://www.hkpro.com/forum/hk-parts-accessories-sale/161420-wts-93-length-wood-handguards.html
or if you want to DIY:
http://www.hkpro.com/forum/hk-clone-talk/146748-wood-furniture-51-53-a.html
http://www.hkpro.com/forum/hk-parts-accessories-sale/161420-wts-93-length-wood-handguards.html
or if you want to DIY:
http://www.hkpro.com/forum/hk-clone-talk/146748-wood-furniture-51-53-a.html