300Whisper in the AR-15 - Quarterbore's Forums

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300Whisper in the AR-15

#25

11-23-2010, 01:40 AM

robrob

Member

Join Date: Sep 2010

Posts: 90

I haven't lightened the carbine buffer yet but cutting off about 3 coils from the carbine buffer spring allows reliable function with 220gr subsonics, both Hornady round nose and Sierra SMKs. It will lock the bolt open with an empty magazine every time and feeding has been perfect.

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