The best thing about the 15-22 is it functions the closest (bolt stays open at empty) and breaks apart very similiar to an AR-15/M4. Its a great platform to train on or be introduced to Assault Rifles on. The best advice I can give you is to skip the Tasco and get a TRUGLO. I compared the two as cheap dots, and the TRUGLO seemed much more quality. A lot of reviews on the internet seem to agree. The parallax of the dot is very low and its great for shooting with both eyes open. I think i paid $50 at Dunhams for it, so I'm sure you can order it much cheaper online.