Ok late to the party but at this point I think it has relevance. Bought a Daystate Huntsman Regal XL .25 a couple of months ago and 3 weeks ago lucked into an AA S510 .25 and have been able to do a side by side comparison Fit ,finish and accuracy are very comparable as is price 1 major difference is power out of the box 31 fpe for the AA and 41 fpe for the Daystate The day state was bought new and as far as I know I am owner #3 for the Air Arms and I don't know what owner #1 did to the Air Arms before it was sold. After some surfing the web the S510 is performing to factory specs . I used Air Arms 25.3 gr Diabolo pellets in both tests so it is a fair evaluation for these results