Geissele SSA-E...large pin or small pin?

KillShot

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May 25, 2010
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Tulsa, Oklahoma
I'm wanting to swap out my Geissele SSA with the Geissele SSA-E but I'm at a loss of what PIN size I need, or how I'm to find out. My rifle specs are in my signature. Thanks in advance for any info you guys can provide.