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Get a new hop chamber.
Tokyo Marui used a 2 piece hop chamber so the M4 and M16 receivers could be split at the rear, like the real rifle.
This, however, was a completely fucktarded idea (especially considering they used a flexible plastic receiver) and only made things weaker and more complicated.
Every decent company that copied Tokyo Marui's design opted for a much more durable "slide apart" design with a much more reliable single piece hop chamber.
And given the variety of things that can go wrong adapting aftermarket metal receivers to plastic guns, let alone the cheapest of aftermarket receivers, it's generally considered a much safer idea to sell the plastic gun and buy a new gun that already has a metal receiver.
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