WALTHER DUKE £250 ON AGF

Having studied the relative costs of co2 I was really surprised to see how excessively expensive the 88g cylinders are compared to the 12g size.  I have seen discussions before, but never studied the numbers.

I can see the appeal of the twin adapters, but at £50 for an adapter it will take around 3000 shots to break-even compared to just using the 88g cylinders.

There is a single adapter which is nearly a quarter of the price of the twin adapter, but as they are an ebay item, the listing is a bit thin on detail.  does anybody have experience of these adapters?

www.ebay.co.uk/itm/154141900875?_trkparms=amclksrc%3DITM%26aid%3D1110018%26algo%3DHOMESPLICE.COMPLISTINGS%26ao%3D1%26asc%3D20200818141841%26meid%3D609f1386ce8645608ed3ee5cce91f7bd%26pid%3D101111%26rk%3D1%26rkt%3D12%26sd%3D115382175816%26itm%3D154141900875%26pmt%3D1%26noa%3D0%26pg%3D2563228%26algv%3DThematicAlgo%26brand%3DUnbranded&_trksid=p2563228.c101111.m2109&amdata=cksum%3A154141900875609f1386ce8645608ed3ee5cce91f7bd%7Cenc%3AAQAHAAAA8LwVoSbxFsxNTl7u%252B0ZoqBYBGO%252B52jE%252BeDClWJHf7ZmzE%252FdFApAlHXgOYo3djp%252Fg6Pgg8X3uBsac3OzsbkafB%252Bb6UEmJTG%252FtHEPJSNf5Ljxx8%252BSLmSxAoJ%252BymgydcbYByZfRuMGFRk1uMxmd%252FROUjzglsD2SuRQeCg1lJbINV64KYvyhIKzCQrc1e8dK4pOGE0BBp8xbku55DcXpGEFXf0mUk%252FsXEYAaHyNX7QkEyqNXcPFArB0HIAs4AkJ4cgxc2n%252B8Dqdju5%252FfR3YeNVRYKbj0BFNn1vGCOaPH8SzMR8aHNlmu5a4%252BkVsY%252F%252Bo7wUClWg%253D%253D%7Campid%3APL_CLK%7Cclp%3A2563228

I imagine there would be no valve in the end to allow the adapter to be removed with gas in, which throws up issues of removing the device from inside the Winchester stock as it is shorter than the 88g cylinder or twin adapter, but I don't see that as a significant issue.

At the price, it seems worth a punt...