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Retro Arms M249 / M60 Box Magazine Bowden Spring Valken The Hopup Chamber M4A unit

$19.99

Quantity
Description

The Hopup Chamber M4A unit is designed to accept 21

Spring Loaded Folding Action

o    A QD swivel socket that can be detached or placed on either side of the stock

ergonomic design with slightly revised texturing for superior grip and control

Retro Arms M249 / M60 Box Magazine Bowden Spring Valken The Hopup Chamber M4A unitBowden spring is used for leading BB's in high capacity magazines, e. g. machineguns.

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