Home / Parts / Buffer Tubes and Kits / Toxic Mil-Spec Steel castle nut Toxic Mil-Spec Steel castle nut$395 Toxic Mil-Spec Steel castle nut quantity Add to cart Category: Buffer Tubes and Kits Product ID: 2405 Description Description Mil-spec carbine castle nut/lock ring for securing lock plate on an adjustable stock for AR-15, M4 Related products Out of stock Sale! KVP AR-10 308 CAR SS TUNGSTEN BUFFER 5.6 OZ. $5999 Original price was: $5999.$3999Current price is: $3999. Sale! Complete Pistol Buffer Tube assembly $6999 Original price was: $6999.$3495Current price is: $3495. Out of stock Sale! Timber Creek GM Quick Disconnect END PLATE $2499 Original price was: $2499.$1899Current price is: $1899. Toxic Mil-Spec buffer tube for pistol w/ pad $1795