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Ar gas block??

Discussion in 'Rifle Country' started by james2133, Sep 5, 2009.

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  1. james2133

    james2133 Member

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    Jun 10, 2007
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    i want to throw some larue parts at the ar 15 and was wondering if anyone could help with what size gas block i need for a rock river with the wilson r-4 16" barrel... the choices are 3/4 and 5/8... any help would be great
     
  2. ants

    ants Member

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    From the picture and description on the RRA site, the R-4 profile on the Wilson barrel appears to be a common commercial version of the milspec M4 profile. That would take a standard 0.750 gas block or sight tower.
     
  3. james2133

    james2133 Member

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    Jun 10, 2007
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    thanks that is what i was thinking but wanted to make sure prior to ordering
     
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