SIG SAUER Spring - Extractor Heavy

SIG SAUER Spring - Extractor Heavy. 56x45mm NATO .300 AAC Blackout .223 Remington Package Contents: SIG SAUER Spring Extractor Heavy SIG SAUER Infinite Guarantee What firearm models does the manufacturer say SIG SAUER Spring Extractor Heavy is compatible with? The manufacturer says that SIG SAUER Spring Extractor Heavy is compatible with SIG Sauer MCXSIG SAUER 2401641-R: Spring - Extractor Heavy