G&P + Madbull compatible?
 

I am looking at doing a completely new upper for my G&P M16

I already have another G&P Upper I can use but nothing else.

So the following parts are what I am looking to get but need to know if they will both mesh with the G&P upper.

http://www.airsoftparts.ca/store2/in...oducts_id=2374

http://www.airsoftparts.ca/store2/in...oducts_id=2362

Thanks!

Barrel yes
Rail not. You would need a G&P specific barrel nut, but there is none for this model.
you could rethread your upper in metric to fit though...

Welcome to G&P hell.

If you absolutely want to do it, you can give the Madbull Delta Ring Modification Tool a shot.