First post: custom M4A1 Gen 9 with metal rails and metal barrel

hey guys, first post here.
M4A1 Gen 9
Metal rails/handguard
metal barrel
metal front sight
black out kit
SLSS Hop up
Stock internals
Stock receiver
266-280FPS

also i need a opinion on Hawkex metal receivers since im looking to change my stock nylon receiver to a metal one. im looking to also upgrade my internals as well but thought this might be the right place for a proper opinion

link to the receiver: https://www.hawkextactical.com.au/products/pre-order-mk1-metal-body-for-well-m4-j9-series-gel-ball-blasters?_pos=3&_sid=ec14acfca&_ss=r

EDIT: HAWKEX METAL RECIEVERS WILL NOT FIT ON J9 STYLE GEARBOXES. i had to do some research about it

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metal receiver are pre-order tho…
and concidering how the shipping delay is atm, there is no saying when the stock will come TAT

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i done up some research and frankly it says that it will not fit J9 style gearboxes where V2 style shit will

Hello, will the gen 9 stock fit onto the gen 8 buffertube?
Thanks