I have seen the NECG aperture sight that attaches to the rear scope dovetail of a M77 receiver, and have read mixed opinions of it. Is there any other similar sight on the market? I recently cobbled together an aperture sight for my M77 Mk II LH out of a Burris Ruger-to-Weaver adapter base and parts of an old Williams receiver sight. I works, but requires a very high front sight. I can't figure out why Williams doesn't make a version of the Guide Receiver Sight that attaches to the Ruger scope dovetail.
Also, does anyone know if the old M77 Round Top was ever made left-handed?