help with bipod attachment

usafa77

Full Member
Minuteman
Supporter
Feb 18, 2017
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Parker, CO
My buddy just bought his first AR. I don't know much about setting them up. It's a nice Stag arms with a Sampson full length forearm. The bottom of the forearm has a series of holes 1 inch apart about a quarter inch in diameter. How do I attach a piece of pic rail to that?
 
Can you be more specific on which handguard? I’m sure the answer is here on samson’s site