I'd say a LPK and maybe a complete BCG. Only problem, they tend to morph into a new AR!
So why not cut to the chase and buy a spare BCM. 
You know what they say about spares ... one is none and two is one.
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The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
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US Army 1966-69, VFW Life Member, Retired Geek
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spare parts?
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