Factory spare parts kit for Barrett .50 BMG rifles M107A1 & M82A1 Spare Parts Kit includes: Trigger Housing Pin Bolt Carrier Pin Extractor Extractor Spring Extractor Plunger Rear Pin Assembly Midlock Pin Assembly Model 99 Spare Parts Kit includes: Trigger Housing Pin Extractor Extractor Spring Bipod Assy. Pin Pin Assy. Model 98B Spare Parts Kit includes: Extractor Extractor Spring Cheek Piece Lock Knob Front Assembly Pin Ejector Ejector Spring Mfg: Barrett Firearms Mfg Inc SPECS: 1 lb.