WE M4 internal HPA adapter (v2 only)

This is the internal, CNC machined part needed for the FIVEFOUR free HPA conversion project. Note: This is an advanced project and should only be attempted by tinkerer or people that have fun with a project. IT ONLY WORKS WITH WE M4 v2. It probably works with WE HK416 v2, WE SCAR L v2 (semi only), WE KAC PDW v2 (semi only), WE MSK v2 (semi only). No guarantee. [Mags are found here (90 rnds double stack)](https://cults3d.com/en/3d-model/tool/we-m4-internal-hpa-pmag-style-magazine) You also need…

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