I bought this Contender barrel today.

Ben

Moderator
Staff member
Wikipedia says :
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The earliest barrels, from early 1967 to late 1967, were all octagonal with a flat bottom lug, and were available in only 10 and 8 3/4 inch lengths. The next group of barrels, from late 1967 to 1972, were available in 6, 8 3/4, and 10 inch lengths. Later, round barrels were added in a wider variety of lengths, including 10", 12", and 14". Likewise, round barrels in heavier (bull) barrel configurations, known as Super 14 pistol and Super 16 pistol barrels, respectively, were added. Carbine barrels in 16 and 21 inches were added for the Contenders.
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I put my .222 barrel on my frame this morning.
Fits perfectly.

Ben
 
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300BLK

Well-Known Member
They were still making the octagon barrels in the early '80s at minimum. I bought an octagon 22LR new back then, and it had the split locking bolt like the one Ben has pictured.