Ar-15/M16 Extractor O-Ring - Extractor ''''donuts'''', 5-Pak

Tiny, high-stress synthetic rubber ring slips around the extractor spring to increase extractor tension for more reliable extraction. Eliminates spring "chatter" to prevent malfunctions caused by the extractor slipping off the cartridge rim. Helps ensure positive, consistent extraction during rapid-fire sequences. Mfg: Tanks Rifle Shop SPECS: Synthetic rubber. Sold in a pak of 5.