SIG SAUER Spring - Bolt Catch

SIG SAUER Spring - Bolt Catch. 56x45mm NATO .300 AAC Blackout .223 Remington Color: Black Finish: Unfinished Package Contents: SIG SAUER Spring Bolt Catch SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER Spring Bolt Catch is compatible with? The manufacturer suggests that SIG SAUER Spring Bolt Catch is compatible with SIG Sauer MCXSIG SAUER 2400908-R: Spring - Bolt Catch