Keep an eye open on HAO’s website for their M27 IAR and HK416N kits for Tokyo Marui MWS ZET System.
Niche? Yes. But also part of a comprehensive range.
As usual, you can expect 7075-T6 aluminium, anodised CNC receivers; steel gun drilled barrel; SUS304 steel gas block; 1:1 compatibility with RS parts in relevant areas; and HAO’s precision – tolerances which mean TM’s internals are a drop in fit and the completed gun will function every bit as well as the OEM.
I would guess the even more niche French HK416F will be next up in HAO’s MWS ZET range, followed by the a lot less niche monolithic UKSF L119A2 in December.