This is for a bipod / sling adaptor designed to fit onto the rail under the stock on some Kolter Airmaster Puncher airguns.

The connects to the rail leaving a standard QD stud to which a standard bipod or sling swivel system can be attached.

The following Kral models are supplied new with the underside rail:
Airmaster Puncher Jumbo
Airmaster Puncher Bigmax
Airmaster Puncher Pitbull
Airmaster Puncher NP-02
Airmaster Puncher Auto
Airmaster Puncher S
Airmaster Puncher Maxi S
Airmaster Puncher Mega S
Airmaster Puncher Armour
Airmaster Puncher Breaker (some versions)

If you are looking to combine this product to fit a sling we recommend our rear stud here

If you do not have a front rail on your rifle you can still fit a sling or bipod using the standard studs here