Could someone explain the difference between the Sig 556R Gen 1 vs. Gen 2?
Is there a quick way to spot the difference?
Is there a quick way to spot the difference?
TinCuda
Steel shelf insert on the lower for the front mag lip to rest on... http://1.bp.blogspot.com/-aIlcuH4KECk/Txj0sxyOz8I/AAAAAAAABkU/reeGUDxzfqU/s1600/IMG_0386.JPG
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