I want to sell a Sig Sauer (Sigarms) Quad Rail without the Rail Covers. I will also trade for a Sig Quad Rail that will fit my Sig 522. This 556 Quad will not fit my 522. I will trade my Quad Rail, my 522 Swiss Rail, and offer some money to boot for a Sig 522 Quad Rail. Please PM me. Price $100 shipped. I can email a picture if interested.