Gunsmithing Adjusting Gas Key to lower receiver gap with a JP silent capture spring?

[M5/M4E1]

I just built my first AR15 and it is an 16” barrel mid length gas system rifle

I installed and Aero precision enhanced buffer tube and screwed that in all the way till level with inside of receiver.

I installed an JP silent capture spring and the buffer head sticks out about 0.060” as JP says that’s the max it should

My concearn is that, I was told that I should be able to fit the thickness of 2 quarters between the gas key and the lower receiver with the Bcg fully inserted.

I have a gap of about 2 quarters however i can’t slip the quarters into the gap as it’s too tight

Am i ok? Or should i shim the silent capture buffer system more? Causing more preload witch JP says not to do?

I just don’t want this receiver to get hit by the Bcg I can’t buy another

In my state

 

[Zak Smith]

You are overthinking this. You have a gap of about 2 quarters? Can you make it hit the receiver? If no, then you are fine.