9mm AR Build - Am I missing anything?

[AndyLate]

I have a 5.56 pistol build that went well and I want to add the capability to run a 9mm upper with it. It will be a bit cheaper to run, quieter and shoot be fun (recreational build).

I am pretty confident with 5.56 builds, but just want to make sure I am not missing something obvious. Please let me know if you see anything missing or a problem with my build.

Lower:
Complete pistol lower with a PSA polished and plated mil spec FCG, KAK Shockwave Blade and RE
Standard (BCM) carbine action spring
Foxtrot Mike 6.5 oz 9mm (extended) buffer
Mean Endomag/Pmag Gen2 conversion

Upper:
11" KAK 9mm barrel w/flash can
"Sport" upper rec.
Spinta 9mm bolt (16 oz)
10" ALG rail
Sights

The only things I am waiting on are the endomag conversion and buffer.

Thoughts?

Thank You

Andy