The Midwest Industries .223 Wylde Upper Receiver w/Combat M-LOK Handguard does have a built in QD sling mount.
The Midwest Industries .223 Wylde Upper Receiver will shoot 5.56 and .223. MPN:MI-N16CRM15-U weighs 2lb 15.4oz. MPN:MI-N16CRM12-U weighs 2lb 14oz. And MPN:MI-N16CRM14-U weighs 2lb 14.9oz.
The Midwest Industries .223 Wylde Upper Receiver (MPN:MI-N16CRM15-U) weighs 2lb 15.4oz. MPN:MI-N16CRM12-U weighs 2lb 14oz. And MPN:MI-N16CRM14-U weighs 2lb 14.9oz.
No, it does not come with either component.
Yes, it is a free floating barrel.
No, it does not come with either.
This dose not come with BCG or Charging handle.
No these particular models do not use Criterion barrels.