Echo trigger question

Ok here is what I ordered.
one coltAr15a4.

I am going to ditch the barrel and trigger
I ordered a CMMG 22lr 20in barrel
an echo2 trigger
and CMMG sear tripper
I noticed the colt has a sear block made into the lower, will this mess me up?
I have never seen a Echo2 trigger in person so I don't know if it will work. If it works I am going to pick up a rail and acog at knobs creek machine gun festival.

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Echo trigger question