N/A Compacts Only

Folder
Pistol carbine
Compact
Super small PUP

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Custom Panthera Hunter Compact 22- Home built Carbon Fiber and Composite Folding Buttstock, Custom 350mm .22 Barrel w/FX Superior Liner, IA-1350 Moderator, Huma Reg, ST ARCA Trigger Guard, 300bar 360cc CF Bottle, Custom 3d Printed Rubber two-tone Red/Black Trim and accessories. DNT Zulus Optic. Shooting 21g NSA Slugs at 900fps.

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I actually want to convert my PROD to an air bottle the way you did it.
90 degree connector attached to the Foster nipple and the air bottle.
I have all the parts.

How does it work for you?
Do you need a barrel band for that?
The reverse bottle works great, keeps action short & compact.
Due to that build having a longer barrel fitted, yes a barrel band is necessary IMO.

Accessing a Stubby HPA bottle a tad more difficult.
 
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I used a paintball asa fitting and some male/male fitting plumbed into my gauge hole on my PRod bottle build. Then added a PVC pipe loop to the bottle and attached that to the bottom of the barrel band. Had to remove the forend stock but gave me a lot of shots. An adjustable bottle reg like the RTI Prophet allowed me to tune with the stock air tube being the plenum.

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