Athlon Optics Helos BTR 6-24x50 Riflescope (DD, SF, 30mm, FFP, APMR IR MIL Reticle)The Athlon Optics Helos BTR Riflescope 6 24x50 (DD, SF, 30mm, FFP, APMR IR MIL Ret.) is a first focal plane rifle scope with locking turrets, crisp turrets, advanced fully multicoated options built from a one piece tube made from aircraft grade 6061 T6 aluminum. Feature rich but wont break the bank. First Focal Plane Reticle First focal plane design allows you to fully utilize specially designed reticles that shrink or grow along with your target as