acgeorge Posted August 20, 2017 Report Posted August 20, 2017 Rock River Arms 308 Top Rail Octagonal Handguard Standard length #308A0010TRB. See it at RRA: RRA TRO Handguard I was able to get a measurement of the difference in height of the handguard rail to the DPMS upper receiver rail. I measure the handguard rail to be .060" higher than the upper rail. My DPMS upper rail measures .150 thick. So, I would feel safe to say, the handguard rail is for a high profile upper (.210") with a 1-7/16 - 18tpi $75 shipped, payment by USPS Money Order, or Paypal Gift Take a look at the pictures and ask any questions
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