Advanced Armament Corporation 90TV Ranger Series Mount 1.375x24 TPI Black. 3 points of retention. Specifications for Advanced Armament Corporation 90TV Ranger Series Mount: Manufacturer: Advanced Armament Corporation Color: Black Features of Advanced Armament Corporation 90TV Ranger Series Mount Forward Taper infront of the ACME and Threads to keep carbon from coming back onto the threads V-Threads to help secure the mount into the adapter and screws into 90T ratchet mount for extra security Package Contents: Advanced Armament Corporation 90TV Ranger Series Mount Advanced Armament Corporation 65039: 90TV Ranger Series Mount 1.375x24 TPI Black