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Joseph, this upper is in caliber .450 Bushmaster. https://www.google.com/search?q=.450+bushmaster+vs+.223&tbm=isch&source=iu&ictx=1&fir=3EAHzIhcJIZ2VM%253A%252CXKDcZ1L_Xp2NpM%252C_&usg=AFrqEzfkdzdRSthVW_kDbrUtmbxSUoHYNw&sa=X&ved=2ahUKEwjgod3roozdAhVmUd8KHdA3CLAQ9QEwAHoECAUQBA#imgrc=_xa4GCVpgMnjrM:
Joseph, this upper is in caliber .450 Bushmaster. google.com/search?q=.450+bushmaster+vs+.223&tbm=isch&source=iu&ictx=1&fir=3EAHzIhcJIZ2VM%253A%252CXKDcZ1L_Xp2NpM%252C_&usg=AFrqEzfkdzdRSthVW_kDbrUtmbxSUoHYNw&sa=X&ved=2ahUKEwjgod3roozdAhVmUd8KHdA3CLAQ9QEwAHoECAUQBA#imgrc=_xa4GCVpgMnjrM
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Joseph, this upper is in caliber .450 Bushmaster. google.com/search?q=.450+bushmaster+vs+.223&tbm=isch&source=iu&ictx=1&fir=3EAHzIhcJIZ2VM%253A%252CXKDcZ1L_Xp2NpM%252C_&usg=AFrqEzfkdzdRSthVW_kDbrUtmbxSUoHYNw&sa=X&ved=2ahUKEwjgod3roozdAhVmUd8KHdA3CLAQ9QEwAHoECAUQBA#imgrc=_xa4GCVpgMnjrM
this upper is in caliber .450 Bushmaster. google.com/search?q=.450+bushmaster+vs+.223&tbm=isch&source=iu&ictx=1&fir=3EAHzIhcJIZ2VM%253A%252CXKDcZ1L_Xp2NpM%252C_&usg=AFrqEzfkdzdRSthVW_kDbrUtmbxSUoHYNw&sa=X&ved=2ahUKEwjgod3roozdAhVmUd8KHdA3CLAQ9QEwAHoECAUQBA#imgrc=_xa4GCVpgMnjrM:
