That is a Leapers/UTG 3-12X44 SWAT scope. SWAT = "Side Wheel parallax Adjustment Turret" They sell various versions of it, starting with a longer, heavier one with wire reticle, then a compact version with wire reticle and finally the one on this rifle with an etched glass reticle. For target work the fine etched glass reticle is nice. These scopes stand up to the reverse recoil of the spring powered air rifle just fine. They may not be the finest scope in the world, but have given me good service for what I do. Anyway, the wheel allows you to adjust the parallax quickly to bring the target into sharp focus. One can rig up a tape around them with range markings and a pointer on the scope mount that will allow you to use it for range estimation. In theory at least. I've not done enough field shooting with it yet to get a feel for that part, but the wheel makes it easier to bring into focus and that's why I've got it. Some folks have developed some fairly elaborate "comma" shaped wheels for fine tuning their target ranging at longer distances.

......one of the rifle coaches at our local high school. It is a public school with a rifle team that has produced some great competitors.

They have a proper compressor for filling scuba tanks, so.......

I actually own two pcp guns, the second is a Crosman 1720T .177 pistol, that I fitted with a stock. It makes for a very handy little carbine. I'm going to have it revalved for a bit more power, as it is shooting at about 750fps. I'd like to get that up a tad more, maybe around 900fps, but it is stunningly accurate right now.

I built an English pub style bell target, which forces you to shoot through a hole to ring a bell. The Crosman will do this easily at 10 meters IF the shooter can do his part. Since you are threading a .177 pellet through a hole that is a bit over .3125 (5/16 washer) a steady hold is paramount. You know if you've done it by the "ding" of the bell.

Otony