You cannot add "Black Polymer HK Vertical Grip 416 G36 UMP MP5" to the cart because the product is out of stock. HK 416A5 Barrel Nut Titanium$27900 SKU: BRLNUTA5TI Category: hide-from-search Tags: 416, 416A5, MR556 Product ID: 4349 Custom made specifically for the HK416A5 ( 416A7/416F ) upper receiver. This barrel nut will not work on standard 416 or MR556 uppers. US made Titanium Fine thread for A5 uppers Silver/Machine Finish US Made Product is out of stock Notify me when this product is back. Please enter a valid email! Subscribe Description Additional information Description Custom made specifically for the HK416A5 ( 416A7/416F ) upper receiver. This barrel nut will not work on standard 416 or MR556 uppers. US made Titanium Fine thread for A5 uppers Silver/Machine Finish US Made Additional information Weight .5 oz Dimensions 3 × 2 × 2 in Manufacturer Black Ops Defense Related products Out of stock HK 416A5 Ambidextrous Mag Release $3900 Out of stock HK 416 Gas Block For 10.5in Barrel Vented German from: $29900 Out of stock HK416 416D Style Front and Rear Sight Set $9900 Out of stock Black Polymer HK Vertical Grip 416 G36 UMP MP5 $3900