Please Read: Sights are not "drop-in" parts, especially for 1911 pistols. There are so many companies, large and small, manufacturing 1911 pistols today and they all have different ideas about dimensional consistency in the sight cut. The only way after-market sight manufacturers can provide you with sights is to manufacture their sights and hold their dimensions on the high side of the range commonly encountered. This means that to install sights on 1911s, you often have to "fit" the sight to the sight cut by finding the surface on the sight that is too big and filing it down until the sight can be installed and still fit tightly. Sometimes it's more than a single surface that has to be fitted. There are instructions for fitting and installation as well as zeroing and calculating sight height in the Instructions tab on the home page. Please be aware of what you are undertaking and if you want some help, reach out to me for installation service. The cost is reasonable and the turnaround time is quick.
The Harrison Design "Retro" rear sight offers a rear sight that does everything that sights costing many times more do, in a package that fits the original 1911 USGI spec dovetail. Like all Harrison Design sights, the Retro has a flat rear blade surface with horizontal serrations machined at 50 lpi to eliminate glare. The outer corners are rounded to eliminate snags and abrasions. The front face is designed to allow one-handed manipulation of the slide. With an overall height of .320" and a notch measuring .140" x .125", the Retro sight offers a sight picture that allows adequate light in to make rapid sight alignment possible, while not being so large that your ability to make accurate shots is compromised. Originally designed by Ted Yost with design enhancements by Harrison Design, the Retro is the perfect rear sight whether you're building a "Retro" custom or looking for a full-featured, moderately priced rear sight that you don't need special machining capabilities to install.
The HD-003 Retro rear sight is now available with either a square notch or a U-notch. Same price - twice the goodness!
Please Read and Print Out Installation Instructions https://shop.harrisoncustom.com/fitting-retro-sights and Zeroing / Locking Down Instructions https://shop.harrisoncustom.com/zeroing-your-new-sights