WE M4 / SCAR Open Bolt to MP5 Magazine HPA Adapter 2026 Edition - PLUG AND PLAY
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This adapter allows you to run HPA on your WE GBB M4, SCAR L, 416, or any other Open Bolt WE rifle.
PLUG & PLAY - Comes pre-fitted with valve, feed lips and gas router - you do not need to use any donor parts. No assembly is required.
US Style HPA Fitting as Standard (most common fitting across industry - compatible with all AIRTAC HPA equipment)
SHIM ADJUSTMENT INSTRUCTIONS
If a CYMA MP5 magazine seems too wide, remove one of the two side wings, marked red on the image below, using a 1.5mm hex key. Some gentle filing of the shims can also be done to improve fitment in the case of CYMA MP5 mags that are stamped too wide.
If a straight MP5 magazine is not feeding or has too much vertical play, install the fitment block inside the magwell, shown in the image below
A BB stopper is fitted to prevent too many BBs dropping when removing the magazine
Includes rear shim, one set of spare feed lips, one set of side shims, a longer valve knocker for certain non TM MWS clones, and all screws required to fit any of our modular magwell bases.
US Style HPA Fitting as Standard (most common fitting across industry - compatible with all AIRTAC HPA equipment)