Home / Services HK416 MR556 / HK 416A5 Extended Castle Nut You cannot add "Tan Polymer HK Rail Covers G28 416A5 RAL8000" 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 HK Style 416A5 Rear Sling Swivel Back Plate $1900 Out of stock HK 416/M27 USMC Style Quad Rail Foregrip Handguard Black $27900 Out of stock HK 416 Gas Block For 10.5in Barrel Vented German from: $29900 Out of stock HK 416D Style Standard Quad Rail Foregrip Handguard Black $14900