These mount are for the v4 6s BLX series Arrmas. 

It is machined out of Billet 6061 T6 aluminum, right here in Milledgeville, IL. The pictures do not do this part justice!

Arrma Infraction, Outcast BLX, Notorious BLX, Talion BLX, Limitless, Infraction and Kraton BLX V4. 

Please be certain you have a V4 model before ordering.