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Our National Match style rear sight (01-140), is designed to fit into the dovetail of GI pattern 1911 pistols. Its extra thick serrated blade is .315" tall for compatibility with new production Colts, and features a .140" wide U notch. User installable (with some hand fitting), no machining required. The newly revised design includes a more rounded profile and additional edge chamfers to improve comfort for handling and carry. Is direct replacement for Colt, Springfield Armory, and other 1911s with GI/Milspec rear dovetail. Compatible with factory front sight on Colt 1991A1, new production Series 70 reproduction, and Springfield Armory Milspec models, and does not affect point of impact. Suggested for use with .175"-.185" height front sight.
Posted by A.T.U. on 1st Nov 2011
I installed the 10-8 NM rear sight on my Colt 1991A1 and what a difference it makes. The original rear sight was thin and prone to breaking. The 10-8 sight is beefier and has a better sight picture..I can actually now see the front sight with my aging eyes. My groups have tightened up as well! This is definitely the rear sight you want to get if you want to replace your rear sight without going through the expense of having the dovetail milled out for a Novak cut. I did this to keep my 1991A1 as GI-looking as possible (spur hammer, arched MSH, no beaver-tail, short trigger) and I'm glad I did. Thanks 10-8 Performance for another high quality product!