Some years back I had a very similar .22 AA S510. As I recall, this rifle, which doesn't have a regulator, would get about about 40 good shots per fill.
I'm trying to get Air Rifle silhouette going at NSRG, perhaps you'd like to come out once we get it off the ground.
I bought it... haven't had a chance to group shoot it yet but I expect it will be great. Chronograph results... 10.34 grain pellet max velocity just under 1000 f/s and minimum at 500 f/s. Light pellets just under 1100 f/s and louder. (it has five settings). Beauty stock.
I have an Air Warrior 12 volt and 110 volt 4500 PSI compressor... works very well.
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Like it! Who is the vendor?
Airgun Source Canada
... had the "ooooooo" in both .177 and .22 and liked them ...