Home / Services HK416 MR556 / HK 416A5 Extended Castle Nut 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 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 Tan Polymer HK Grip 416A5 G28 M110 RAL8000 $3900 Out of stock HK 416/M27 Style Bayonet Lug $4900 Out of stock Clone/Reproduction HK M110A1 SDMR Scope And Mount $49900