Hopefully Someone Can Help

are you dead set on keeping the lower?

because something like this: https://www.ak2m4.co.uk/external-parts/metal-body/ec-m4-receiver-set-colt-style-engraved-bk would suit nicely.

i'm running that exact reciever and it works very nicely.
Yeah I’m going to keep the lower 

so a g&p upper then, surely?
Trouble is finding one there either out of stock or truly expensive  

 
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