[JasonM]

Does anyone know where I can get a pair of reduced power springs?
My MPX doesn't eject properly with my low powered competition loads.

 

[PDXGS]

Talk to the folks at In Lead Wee Trust.
I don't think that they sell springs, yet. But they can help with gas system upgrades.
My MPX choked on anything like a stock 115 gr load until I dialed in the gas system.

 

[JasonM]

I have an ILWT barrel, gas block, and gas valve. Are they adjustable?

 

[MgoBlue]

Does anyone know where I can get a pair of reduced power springs?
My MPX doesn't eject properly with my low powered competition loads.

I take it you're not shooting suppressed. Myself, i'd like to see some high power springs similar to the concept of the Tubbs chrome silicon flat wire springs for the AR to help increase bolt lock time just a bit more to reduce gas out of the ejection port.

I had another forum member respond to my point about the 2 O' Clock ejection pattern and they indicated it was designed that way to ensure the spent casing is thrown clear of the operator vs near their feet, while a valid point I'd still prefer to have them thrown well clear at the 4:00 or 4:30 position.

The Gen II models were sent out with a reduced gas port probably at the request of suppressor owners which as you found out doesn't work for the low powered loads. You will need to find a competent smith like ILWT as mentioned to open it up to the Gen 1 size.

 

[sigmpx2017]

My stock Gen II MPX functions flawlessly with 115, 124 and 147 both suppressed and not.