Planned build, anyone see anything incompatible?

SI-90 w/ Krytac Modular Receiver, Flare smoke tracer, 1" barrel extension in case I need clearance between the tracer and stock. Three 200/50 Krytac Mags (plus the 100-round mag that comes with the SI-90).

Pouches from other sources. Reusing a red dot from another build.