Shortened 551 with an AK style recoil spring and guide, proved to be less than perfectly reliable so it was replaced or upgraded to the SG553 spec in the Swiss military.
#rifle #Sig #Sig552 #SigSauer #SG550 #SG551 #SG552 #SG553 #SG556 #PE90 #556 #SwissArms #Sig550 #Sig551 #Sig552 #Sig553 #Sig556
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