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"The dimension of the KWA Gearbox Gen 1 and 2GX both fit perfectly on many after market LOWER receiver. Body pins are in correct position. It doesn't fit CA receiver properly because their pins are of set position.
What's NOT compatible is the UPPER receiver when using 2GX gearbox. The reinforced front will not allow upper to "Slide" in place.
And just for the record I have KWA Gen 1 gearbox fit in Prime LR300, Hurricane HK416, Madbull JP Rifle kit, G&P receiver with no modification etc."
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 King Arms M4A1 Colt : ICS M4 C-15 : KJW G23
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