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Unmarked Upper Receivers
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Caliber
5.7x28mm
(15)
5.56x45mm NATO
(141)
6.5mm Creedmoor
(6)
6.5mm Grendel
(1)
7.62x39mm
(18)
7.62x51mm NATO
(2)
9x19mm
(43)
12 ga
(1)
22LR
(23)
40 S&W
(4)
223 Rem
(169)
223 WYLDE
(57)
300 AAC Blackout
(90)
300 PRC
(1)
300 Whisper
(1)
308 WIN
(20)
338 Lapua
(2)
410 ga
(2)
458 SOCOM
(3)
Multi
(4)
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