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Engineering douchbaggery typical in aftermarket airsoft. PDI doesn't realize that the round ends of the aluminum barrel block and the significant axial preload on the barrel exert a self centering force which does not require a tight press fit in the lateral direction.
Think about how the barrel pocket loads against the rear of the barrel block. The round contact causes a self centering if the barrel block has a close fit in the hop up body.
Achieving tight fits in between barrel pocket, barrel block, and hop up requires close fits in three parts which is statistically difficult.
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