Actually , you are right , thier is plastic in that one , and it shows its a 50 BMG , the AI AW50 , has 2x red plastic dust covers , look like big round red dots , on either side of the action body , keeps sand and dirt out of the 2 action gas vent ports at about the 2 & 10 oclock position .
I think also one in the bolt body as well , so IF it does blow UP , the explosion goes in controlled directions .
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