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6.8mm

  1. AR-15 Talk
    Well It happened. http://www.ruger.com/products/sr556/specSheets/5909.html http://www.ruger.com/products/sr556/models.html Still same old SAMMI and 1 in 10 twist with 6 grooves...Don't shoot tactical loads or hot hand loads in this one people... Other wise its a start...and is capable of a...
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