LANTAC BC-PRO Upgrade Bolt Catch BLACK. No investment casting or MIM production. The BC-PRO catch features an aggressive grip texture enlarged paddle and supporting geometry that increases strength around the pivot hole area as well as allowing for easier manipulation of the bolt catch control itself. Comes complete with roll pin. Please Note: A mil-spec bolt catch spring and plunger are required for assembly and are NOT included. If the BC-PRO Bolt Catch is replacing an existing mil-spec bolt catch please use care when disassembling the component from your lower receiver as you will need these parts to install the BC-PRO. Compatibility with other billet AR-15 upper & lower receivers is unknown. The BC-PRO functions with Forged Receiver sets and Raven Onyx Receiver Sets. Specifications for LANTAC BC-PRO Upgrade Bolt Catch: Manufacturer: LANTAC Gun Model: AR-15 Fabric/Material: 17-4 PH Stainless Steel Color: Black Features of LANTAC BC-PRO Upgrade Bolt Catch Precision Machined 17-4PH H900 Stainless Steel. Aggressive Grip Texture Enhanced Strength. Easier manipulation. Made in specialized factories. Package Contents: LANTAC BC-PRO Upgrade Bolt Catch What firearm models does the manufacturer say LANTAC BC-PRO Upgrade Bolt Catch is compatible with? The manufacturer suggests that LANTAC BC-PRO Upgrade Bolt Catch is compatible with AR-15LANTAC 01-LP-BC-PRO: BC-PRO Upgrade Bolt Catch BLACK