Bolt doesn't move much during shot

[Shivesy]

Check the gas block itself, check the gas port. Sometimes a little chip will get stuck in it.

Check the gas tube to make sure there is no pinch in it anywhere.

Call your barrel manufacturer and check the port diameter specs.

I would NOT drill the port until I was sure that it was the issue, and then I would use an adjustable gas block, just in case.

Do you have another lower? See if it functions on that lower if so.

Thanks for the reply,

I have my adjustable gas block opened up all the way and this is the only lower (Rock River) that I have and it works just fine with my RR 223 20" upper. Everything is new and clear. Gas block, gas tube, carrier key, buffer and spring ect. The spent cartridge is removed by the charging handle with no excessive force.