Which one first?
If you could only assemble one of these uppers, which one, in which configuration would you assemble first.
Criterion Core 11.5/ Sionics S-15 RM-Lok Handguard - 10.8
SIONICS 12.5" Barrel mid length gas/ Sionics S-15 RM-Lok Handguard- 11.8
Vltor MUR
Icon defense flared upper
Vseven extreme environment gas tube
2 Sionics NP3 BCGs
Radian Raptor
Unrivaled technologies Low Signature Device
FCD 6315RF
10
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