Luth-AR AR-15 Bolt Catch Kit Features The Luth-AR Bolt Catch Kit bundles the bolt catch spring buffer plunger and roll pin into a single purchase saving builders from hunting down four separate small parts across different listings. These components are essential to how an AR-15 locks the bolt open on an empty magazine a function that depends on all four parts working together correctly. Supplying a complete correctly matched set reduces the risk of mixing mismatched parts that can cause the bolt catch to function unreliably. Built for the 5.56 and .223 Rem AR-15 platform the kit is sized and specified to fit a standard AR-15 lower receiver without modification. For a builder assembling a lower receiver from a stripped parts kit having the bolt catch assembly as one complete set simplifies the build considerably. It is equally useful for a repair replacing a worn or lost bolt catch spring or roll pin without needing to buy a full parts kit over again. At under half an ounce the kit adds no meaningful weight or cost to a build. The Luth-AR Bolt Catch Kit is a simple practical component set for any AR-15 build or repair project. Luth-AR AR-15 Bolt Catch Kit Specifications Manufacturer: Luth-AR Model: Bolt Catch Kit Compatible Hosts: AR-15 Caliber: 5.56 / .223 Rem Includes: Bolt Catch Spring Buffer Plunger Roll Pin Weight: 0.48 oz Available At: GrabAGun