We scar-L Ra-tech nozzle

[darack]

Hi! I just instal the Ra-tech nozzle with npas on my scar and I got one issue!
My old mag don't shoot well (was shooting well last week), but my 3 new one shoot perfect!

For now, I know is not my feeding lips
Not my discharge valve
No leek
The mag is tite in the lower

My old mag are v2

And my news one seems to be some kind of a v2.1 (2 screws for olding the feeding lips)

I notice that he gaz passage is not similar in both of them, can it be the reasons why it shoot well the news design and not with the old one?

Thanks for your help!

Darack

[darack]

Banana!