This bayonet-type mounting standard was introduced by Pulsar on their Forward F135 and Forward F155 digital night vision clip-ons in 2017. It is an improved version of the Pulsar DFA75 mounting standard – it features four notches instead of two to assure a snug fit. The adapter is installed in place by inserting the adapter pins into the notches on the bayonet and turning the adapter counterclockwise.
Some adapters on the market fit directly on the bayonet, while a reducing ring (converter) is needed with others.
Pulsar Forward mounting standard on Pulsar Forward F455S
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With Smartclip, Rusan, Recknagel, and Präzise Jagen adapters you need to choose the size based on the outer objective diameter of the riflescope.
Our list of riflescopes and their outer objective diameters is available here
Rusan reducing ring for the Pulsar Forward standard can be paired with Rusan, Smartclip and Recknagel adapter for the M52x0.75 mounting standard.
Our article with all the mounting standards on NV and thermal clip-on devices is available here