Thread: Ar-15 300-221 Sbr
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Old 04-09-2009, 12:11 AM
AlcoholicusMaximus AlcoholicusMaximus is offline
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Join Date: Nov 2007
Posts: 39
I have a 10.5" M1S SBR AR15 & found that I didn't need an adjustable gas block when I drilled my gas port to .086". I am cycling 220gr subsonics, & all types of supersonics. Just curious, why are you choosing a 14" barrel for your SBR?
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