52031 AEG-B4K-120-TS
78571 AEG-B4SOPMODSD-TN
38432 Rifle-BOLT-BSR16URX3-R-120-T
78573 AEG-B4DEVGRUK12-TN
55081 AEG-Bolt-B4LRP-120-T
46541 AEG-BRS-SOPMOD-TN