Gentlemen,

I have a transferable M16 and I'm wanting to run the new Spear 5.56 Upper on my M16 lower.
I have the SSF trigger in the M16 lower.

I'm getting ready to install the Parker sear trip, but just wanted to see if this is all I need to do outside of removing the buffer and installing Sig's AR adapter kit?

I'm still confused about the triggers breaking and if my setup could have this issue?
What is the trigger pin for that comes with the Parker Machine sear trip? Do I need to install it for any reason?

Is there any way this setup could damage the registered M16 lower or wear it faster than a standard DI upper?

Thanks Guys!!

I run my rattler upper with my RDIAS.

Works perfectly. Geissele full auto m16 FCG, PMM trip and a G firing pin safety but you won’t need that with the new SPEAR upper.

Have fun, they are great rifles/uppers.

ThANKS SIR!