The Stern Defense BU9 is a 9mm AR-15 bolt in 8620 AISI steel with a mag phosphate finish. It fits mil-spec and Glock-pattern uppers and works with Colt SMG and Glock magazines.
- Manufacturer Part # : 004SDBU9D1M
- Type : AR-15 Bolt
- Caliber : 9mm
- Material : 8620 AISI Steel
- Finish : Mag Phosphate
- Magazine Compatibility : Colt SMG, Glock
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