Looking through shotgun news for a upper. Planning on a bull barrel SS upper 223/556 20 inch. i see uppers going for about 350-400$. On the page next to it shows a Upper KIT. for about 550-600. Do i need the KIT or the upper for 350-400. The upper description does not say if it comes with a the bolt group.Also the descriptions say A2 and A3 any info on that
thanx
Rob
thanx
Rob

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