Today for sale is rare H&K MR556 with an extra 416 upper receiver it is the true 10.4 brownells BRN4 upper brand new.
The MR556 is slightly used with a Surefire muzzle device but it’s been sitting in the safe too long so I’m passing it on. The 416 upper is brand new with no rounds through it. Was going to make it an SBR but never did. Cash only Located Texas city area Fast response 9037144952