Crosstac AR-15 Armorer Block Full Kit w/ Hammer Block/Roll Pin Punch White

Crosstac AR-15 Armorer Block Full Kit w/ Hammer Block/Roll Pin Punch White. They have a patented hammer block system whereas the pistol blocks only have a U-notch on the side of the block while all other blocks have a flat face that allows the gunsmith or armorer to roll pins without damage. They are excellent for storing your rifle until needed then can act as a wrench to hold the receiver in place for removal and installation. They have retention straps to keep them in place and dont slip even