The KAC E3.2 bolt is now shipping with SR-15 5.56mm rifles and upper receiver kits.
The E3.2 bolt was purpose-built to provide extended service life and enhanced reliability in all conditions. The prominent dual ejectors ensure clean and consistent ejection even when a traditional high-backpressure suppressor is used. Refined lug geometry and optimized material selection ensures lug durability in excess of even the industry-leading KAC E3 bolt. A Viton O-ring prevents extractor vibration and lift, and a hard chrome exterior simplifies cleaning and maintenance.
For use with the KAC E3 barrel extension.
Scattered Shots 
Somebody else used to manufacture an enhanced bolt with “lobster tail” extractor, maybe LMT?
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I believe it was LMT
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