Lyman 57SML Rear Sight. OpticsPlanet Inc is an Authorized US Distributor for Lyman Tritium & Fiber Optic Night Sights. Improve your accuracy with a Lyman receiver sight. The most popular black powder receiver sight offers an immediate improvement in accuracy for the target shooter or hunter. Features 1/4 minute micrometer click adjustments for elevation and windage quick release slide. 57SML fits perfectly on Lyman Deerstalker or Trade Rifle. Other models may require minor drilling and tapping depending on manufacturer. 57GPR fits Great Plains with supplied adapter. WEIGHT: 4 oz Lyman 57SML and 57GPR Receiver Sights is available with the following options: Lyman 3090112 57GPR Receiver Sight For G.Plains Rifle Lyman 3090114 57SML Rear Sight We offer complete line of Lyman Tritium & Fiber Optic Night Sights. For our complete selection of products by Lyman on sale please visit our Lyman page. For more Tritium & Fiber Optic Night Sights please visit our Tritium & Fiber Optic Night Sights store section. Package Contents: Lyman 57SML and 57GPR Receiver Sights Lyman 57SML Rear Sight 3090114