Home / Services HK416 MR556 / HK 416A5 Extended Castle Nut You cannot add "HK417 MR762 16in Factory Barrel G28 M110 Heavy" to the cart because the product is out of stock. HK 416A5 Extended Castle Nut$2400 SKU: CSTLNUTA5 Categories: 416 417 G28 M110, Services HK416 MR556 Tags: 416, 416A5, MR556 Product ID: 4355 HK 416A5/A7/F extended castle nut, steel These are perfect for the 416, 416A5, 416A7 and any other compatible platform. Steel Black Excellent fit and finish, just like factory Product is out of stock Notify me when this product is back. Please enter a valid email! Subscribe Description Additional information Description HK 416A5/A7/F extended castle nut, steel These are perfect for the 416, 416A5, 416A7 and any other compatible platform. Steel Black Excellent fit and finish, just like factory Additional information Weight 5 oz Dimensions 2 × 1 × 1 in Related products Out of stock Tan Polymer Selector Set 416A5 417 G28 RAL8000 $9900 HK 416A5 Style Quad Rail Foregrip Handguard Black $27900 Out of stock Sale! HK 416 Factory Full Auto Complete Bolt Group New $1,69900 Original price was: $1,69900.$1,49900Current price is: $1,49900. Out of stock HK 416C Style Short Quad Rail Foregrip Handguard Black $17900