Complete SIG M400 Tread - Factory 16", 1:8 twist, stainless steel barrel, SIG low-profile gas block, SIG mid-length gas system, 5.56 NATO

Elftmann Tactical ELF 3-Gun Flat Trigger (Adjustable 2.75–4lb pull with sealed roller bearings. Crisp, zero-creep break)

Radian Raptor LT Ambi Charging Handle

Sig Sauer BCG

Sig Sauer M400 Tread M-LOK Forward Grip 

Steel Magpul MBUS Pro 45-degree backup sights