PANZER ARMS AR57 ULT 5.7x28mm 16" Complete Upper Receiver w/ BCG & 50 Round Magazine - M-LOK | Black

CMMG Dissent 6.50" Upper 5.7x28mm with 1:9 Twist Rate and M-LOK Rail - Pistol-Length with Charging Handle - Armor Black - 57BA8AEAB

CMMG Banshee 5.7x28mm Upper with 5" Barrel, Black - 57BBCF0AB

Patriot Ordnance Factory Minuteman 10.5" Complete Upper 5.56x45mm, Patriot Brown - 1817

Panzer AR57 16" ULT Upper Assembly 5.7x28mm w/ 50 rd Mag - ULT 0116

Panzer AR57 ULT Upper Assembly 5.7x28mm 12" - AR57ULT-12

CMMG Resolute 16.10" Upper 5.7x28mm with 1:9 Twist Rate and M-LOK Rail - Carbine-Length with BCG and CH - Armor Black - 57B40E4AB

CMMG Banshee 8" Upper 5.7x28mm 1:9 M-LOK Carbine-Length, Black