Alley Supply/Sweeny Sitealine M1a/M14 Aperture Front Sight
Cleaner sight and target definition plus greatly reduced eye-strain for higher match scores. Installs easily; no permanent alterations to rifle. Legal in NRA ""Match Rifle"" category only. Mfg: Alley Supply/Sweeny Sitealine SPECS: Sight - Blued Steel, 1"" (2.5cm) long, .625"" (15.8mm) diameter, .8 oz. (25g) wt. Insert Set - Blued Steel, 2 post, 4 apertures included; 0.554"" (nominal) OD. Inserts also fit Redfield 65/66 series.