If you mean the Dominator 1250, I have one in .177. I bought it cheap on a Black Friday sale, under $150. Not easy to fill without adapters, cylinder removal… There is a kit to use a fill probe, but it isn’t cheap. There is a review on Hard air magazine. Mine shoots well, but it is so light you have to be careful with the hold. It is accurate and it does real well with NSA 12.5 gr slugs. I wish it had a threaded barrel, but a tko can quiet it. There is a single loader shuttle you can get for it from Britain. Mine is pellet picky.