If you selected "carbine", it is the correct length. If you're going to get it, get the roll pin too.
But there are plenty of other items to stock as spare parts before a gas tube.
Firing pin retainer
Complete bolt
Cam pin
Extractor
Extractor spring
Extractor o-ring
Gas rings
Detents (for take down pin, pivot pin, safety selector)
Springs (all flavors)
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