Downstairs on the lower receiver, have spare springs and detents for the pivot / takedown pins. AR-15 hammer and trigger springs rarely break, but if you're using lighter-power springs, keep standard-power spares on hand. If your rifle stops working, swap in the factory-spec springs to find out if the problem is the gun or your ammo. The buffer bumper pad (say that three times fast!) can wear out in certain circumstances; Caleb explains. Steve's Wisdom: If you've upgraded your trigger, keep the original one as a backup spare. For the other small parts, pins, and springs, keep spares on hand mainly because they can get lost when you've got the gun disassembled for cleaning. Why lose a day at the range when you can reach into your ditty bag and swap in a spare in a few seconds?
Are there any parts the guys haven't mentioned? If so, tell us in the comments below.
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