The new Pulsar Forward DFA75 is packed with the latest features and enhancements. This device fits on to the front optical bell of a day telescopic sight using a specially designed metal mounting assembly. Picatinny rails are NOT REQUIRED so this means you can attach this device to any standard sporting rifle or handgun outfitted with a telescopic sight with a front bell diameter of 42 to 56mm. Recoil rated to 375 H&H Mag !!