Aero Precision APAR308554M45 M5E1 Enhanced Receiver 6.5 Creedmoor 20" Stainless Steel Barrel, 7075-T6 Aluminum Black Anodized Receiver, Aero Gen2 Enhanced Free-Floating M-LOK Handguard for M5 Platform $769.99
Bushmaster 0040004BLK M4 Patrolmans Upper 5.56x45mm NATO 16" Black Nitride Barrel, 7075-T6 Aluminum Black Receiver, M4 Handguard for AR-Platform $591.20
Aero Precision APAR308503AC Assembled Receiver 308 Win 7075-T6 Aluminum Black Hard Coat Anodized Receiver for M5 Platform $194.99
Spikes STU5435R2S Complete Upper 5.56x45mm NATO 16" Black Phosphate/Midlength Barrel, 7075-T6 Aluminum Black Receiver, 12" SAR3 Free-Floating Handguard for AR-15 $788.40