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The only functional difference between a two piece and single piece hop chamber is that the single piece hop chamber will not allow a plastic receiver to be split from the rear like a real steel receiver.
They are designed to use the same mags. $200-$300 metal receivers were expensive enough on their own back when they first came out. If we had to buy $160 worth of new mags as well, no one would have ever bought a metal receiver.
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