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I also bought a $7 stock wrench with 3 teeth for the castle nut. It works fine and has a slot to remove the rifle extension.
 

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7$ one from amazon worked for me. I hope the stock you bought came with a buffer tube, spring, and buffer because the A2 parts do not interchange with m4 style stock.
Good point! We're assuming the OP bought a complete BCM M4 stock kit, not planning to use parts from the existing A2 kit.
 

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I have two BCM M4 stock kits and they're high quality. You done good!
 
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