You will be hard pressed to beat a Nikon PROSTAFF scope for low light performance. Nikon's new P-Tactical Rimfire would serve your needs very well. The 2-7x32 will let you see your target and make a shot that counts. This past weekeknd I took 2 corn thiefs with mine about 15 min after sunset and with a suppressor didn't even scare deer that were 150 yards away. Another nice option would be Nikon's full size PROSTAFF 3-9x40 scope. Even better light transmission and it is on sale right now for $30 off.