I have a used DD M4A1 upper for sale. It started life as the Brownells SOCOM 16" carbine upper. I had ADCO replace the barrel with a DD 14.5 midlength barrel and pin the gas block and SF brake. So this is a factory built non NFA upper. It comes with a nickel boron BCG and regular charging handle. The upper has exactly 975 rds through it. Asking $750 shipped via paypal gift or you cover the fee. Only partial trade would be a Geissele MCX trigger.
