For an easy process, use: HPA Adapter Builder | Black Variable

HPA Builder Bases

V3 HPA Adapter "base" for use with KWA Kriss Vector and the Builder Tool. This is the base only: use the Black Variable Adapter Builder Tool. This does not include "Baby Mag Conversion" baseplates. This does include the HPA fittings. Note: This is made-to-order. Estimated fulfillment is 2 weeks minimum, but could ship...
V3 HPA Adapter "base" for use with WE-TECH M4 (or M4 compatible) and the Builder Tool. This is the base only: use the Black Variable Adapter Builder Tool. This does include the HPA fittings. Note: This is made-to-order. Estimated fulfillment is 2 weeks minimum, but could ship earlier.Note 2: Version 3 uses a...
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