Shotgun conversion to HPA

[Pollynator_bravo2]

Morning All. 
I am looking to upgrade my pump action gas shotgun to HPA. What do I need on my shopping list to make this a completable task please??

 

[Guest]

Morning All. 
I am looking to upgrade my pump action gas shotgun to HPA. What do I need on my shopping list to make this a completable task please??

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Depends what shotty you have and how you fill it with gas now.

Easiest way is replace the gas inlet valve with an HPA tap, get a line, a regulator and a bottle and plug it all in

 

[Pollynator_bravo2]

Awesome. I’ll try and find the make of my shottie. In the mean time is there a particular size if fitting I should look for or is there just one standard ? I fill the gas through a little point which is exposed when I retract the stock