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 In stock HK 416A5 Extended Castle Nut quantity Add to cart 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 WAITLIST NOW HK 416A5 Extended Ambidextrous Bolt Catch Release $8900 Out of stock WAITLIST NOW Tan Polymer HK Rail Covers G28 416A5 RAL8000 $4900 Out of stock WAITLIST NOW HK 416 Gas Block For 16in Barrel Vented German $19900 SALE HK 416D Style Standard Quad Rail Foregrip Handguard Black $17900 Original price was: $17900.$14900Current price is: $14900.