The popular B&T MP9, GBB submachine gun is a powerful CQB airsoft gun, and in some CQB ranges, it might be to powerful, this drop-in replacement part will reduce velocity with 15-22 m/s (50-70fps) putting the MP9 well below the maximum limits on airsoft ranges everywhere.
The Low-power bolt assembly contains valve, piston and cylinder.
Installation requires experience in disassembling the MP9, and should be carried out by a skilled technician.
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