The Sig Sauer ROMEO1 Reflex Sight Mount Kit replaces the rear sight of your pistol and allows for the mounting of the Sig Sauer ROMEO1 Reflex Red Dot Sight. Note: Image shows mount for Standard 1911 (897534), all mounts are similar but may differ slightly in dimensions. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.