Fx impact m3 Gen3 Huma Regulator issue

[IRBR]

hi everyone
i have strange issue
i bought FX impact m3 power block version
i 've wanted to replace AMP regulator to huma gen 3 regulator
but i can't put it in rifle
it seem that huma regulator body bigger than standard apm regulator and after one or two turn stop to turn anymore
any one have any suggestion?

 

[Ca_Varminter]

I had no problems with the installation on my HP gen3.
Have looked down the "Hole" ??? with a flashlight???
May be one of the Belleville happen to drop down there???

 

[7Green]

Same, mine went in easy. Make sure no belleville washers got left behind from the amp reg. Then compare the thread diameter and pitch between both in case they shipped the wrong one.