I'm building a flat-top and will need a rear BUIS. I'm totally undecided between the two. Anyone with more experience care to chime in?
ARMS #40L Flip Up Rear Sight - Low
- spring loaded with a quick release lever.
Two aperatures, one for 250-300m and one for 500-600m.
Del-Ton, Inc. AR-15 ARMS #40L Flip Up Rear Sight - Low
They both cost $118 + shipping.