That's why you buy what you'll need in the next 30 years from the start. What's really important is small parts kits that have pins, springs, trigger components, allen screws (lol some people hate the xcr for that), etc, and a spare BCG/Piston assembley.
The way I see it, it seems like most people barely put enough rounds in their new wonder rifle to cause a parts breakage before they sell it for the next awesome "reload faster than light" rifle that comes out.
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