I hear the bushnell TRS-25 is a good optic may be a bit large for the buckmark though perhaps the vortex sparc2.

JYD#176
"dein Gott schickte mich zu zerstören"
"Sic semper evello mortem Tyrannis"
"Sometimes the chance of a zombie outbreak is the only reason I need to make many of my life's Decisions." General Delivery