Very clear glass, compact scope, works well wit ar-15 carbine/rifle or air rifle - Athlon Optics Helos BTR Gen II 2-12x42mm 30mm Tube Rifle Scope, First Focal Plane

This ATHLON Helos BTR scope has very clear glass and gives sharp target image. Compact for a 12x power at 12.75". I have used it both for an air rifle BSA Scorpion SE .25 cal and an ADM UIC Mod2 5.56mm Carbine 13.9". The FFP reticle is useable from magnification power 2x thru 12x, although the circle-dot reticle is on the thick side at 10x-12x magnification. Reticle thickness is about right at 6x-8x power.

One major flaw of this scope is the inaccurate markings on the distance knob. At an actual distance of 10 yards, the dial marking is at 15, an actual distance of 25 yards shows about 30 yards on the dial. I wish there is a way to correct this problem.

Overall, I am satisfied with the quality of this scope despite the flaws I have described.