Possible project for an early upper

[RCS]

Sometime in the early 1980's I received this barrel as a gift from a good friend, he said he had found this barrel in the early 1960's. It is chambered for the 5.56mm and has a twist of 1:14 and is six groove. Also found a steel gas tube and early flat front sight base. Any opinions concerning the barrel ?Attachment 23970Attachment 23969Attachment 23968Attachment 23971

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[browningautorifle]

It seems you already have something in mind...

[jmoore]

Could have been for a 220 Swift or .22 Hornet or whatever else before it was chambered. If you want to make an AR barrel out of it, then have at it!

[browningautorifle]

You can well shoot it as an AR barrel but for best performance just keep the bullet weight low. Like 45gr or 52 gr. Lighter is better.