Well, I decided to try out the Harrison Extreme Service fixed rear sight on my Springfield Armory Range Officer and placed an order for it today. A review will follow once I have it installed and tested. For now, see the manufacturer's description below.
The rugged HD-002 Extreme Service fixed rear sight is available plain black. It fits 1911 slides machined to mount the LPA adjustable rear sight as used by Springfield Armory and other 1911 manufacturers. The HD-002 is CNC machined and incorporates the most*desirable*features in a 1911 rear sight. The rear blade is serrated 50 lpi to reduce glare and reflection. All edges and corners are machine radiused for handling, carrying and operational comfort. The front face of the sight is squared to allow one-handed operation. The notch dimensions are .135" x .125" to allow adequate light into the sight picture, assuring a rapid sight acquisition and alignment. The HD-002 has become a favorite for use in custom installations, due to it's good looks and balanced proportions. The HD-002 will often regulate with the OEM front sight, or with new installations in the range from .170" to .200", depending on the pistol.
Fits all Springfield Armory models with adjustable sights, (except TRP Operator - see HD-001) including the new Range Officer. Also fits some models of Para-Ordnance, Charles Daly, STI Spartan and other pistols machined for the LPA adjustable rear sight.