Picitinny rail?

Discussion in 'Glock Forum' started by LV2LKnLD, Jul 31, 2009.

  1. LV2LKnLD

    LV2LKnLD New Member

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    Ok I just pickes up my 21SF and it has the new picitinny rails on it. What is the differance for and do I have to watch what I buy as far as accessories go to be compatible?