FX fx impact m4 first 10 shots are slow

I dispatched following parts to Croatia, US and UK to fix slow shots problem in M3 and M4. My personal M3 is also fine since I installed this part. So far every friend using it has no complaints. YouTube video is also available.

FX should have fixed this issue much earlier.

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I would like to purchase 2 pcs from you, can you send me a PM? I cannot pm yet.
 
That’s why when I see internet cures for any gun with an illness, depending on the issue I can remain skeptical. With this particular issue I’m definitely skeptical. It’s the difference between a cure and remission. Without a flat surface for any oring to rest on, a magic oring or not, I think the problem will return. One of my three guns is just using a peek disc and a 90 oring. Been at least two years and thousands of shots because it’s my test barrel and primary hunting gun. Slow first shots haven’t returned. The other two guns have redesigned MKl plenum plugs for more than two years and they have been fine also. Glad you reported back.
Hi, what is a “peek disk”? Where can it and the 90 oring be purchased? Thanks
 

This guy sales them here is his YouTube channel as well