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 HK 416A5 Extended Ambidextrous Bolt Catch Release $8900 Out of stock Clone/Reproduction HK M110A1 SDMR Scope And Mount $49900 Out of stock Sale! Billet 416 Receiver by Black Ops Defense $89900 Original price was: $89900.$79900Current price is: $79900. Out of stock HK 416D Style Standard Quad Rail Foregrip Handguard Black $14900