Criterion Barrels, Inc. - To pin or not to pin: Pinning the gas block negatively effects barrel harmonics and can result in a tight spot in the bore. When pinning the gas
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15A58M16NSQ-APGB - Faxon 16 Gov't/Socom Profile AR15 Barrel, 5.56 Nato, Pinned Gas Block - AR15Discounts
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Smith & Wesson K Frame Model 1905 4th Change 4.9" Pinned Barrel .38 Special Used – USA Guns And Gear-Your Favorite Gun Parts Store
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