Cooey based tranquilizer rifle fires 209 primers

Here is a very unusual rifle. Bore is 0.433" after the .177" short rifled section ahead of a centre fire chamber that accepts a 209 shot shell primer, but the firing pin is too short to fire. The rifle will not fire any rimfire as it is centre fire. In other words engineered to not accept known ammunition, so as to avoid over pressure / over speed of a dart.

I believe this is a non gun because it cannot accept a known ammunition and is designed to project tranquilizer darts or biopsy darts at less than 500

FPS.

The rifle is made from a Cooey but will not accept a Cooey bolt as the chamber is set back. The chamber will accept a Flobert blank but the rifle is centre fire so will not fire the blank. Regular .22 short will not chamber as the chamber steps down too soon to 0.177"

'. There is no extractor so I assume user must pick out the 209. 

I don't see any like it on the internet.

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