The Blackout Defense Zero Trigger does not come with anti-walk trigger pins. The Wilson Combat Anti-Walk Hammer/Trigger Set Pins will work and can be found at the link below.
https://www.opticsplanet.com/wilson-combat-anti-walk-hammer-trigger-set-pins.html
Yes, the Blackout Defense Zero AR-15 Trigger will be compatible with your M4E1 Enhanced lower receiver with 45-degree selector. You will need to purchase 0.154" trigger pins for installation.
The Blackout Defense Zero Trigger features a fixed trigger pull weight of either 3 or 4.5 pounds.
The Blackout Defense Zero Trigger is compatible with a Radian Weapons Ambidextrous safety.
Blackout Defense states that their Zero Trigger is not Compatible with AR-10 or Pistol Caliber Carbines. I would recommend the Elftmann Tactical Elftman AR-9 Trigger, found by using the link below:
https://www.opticsplanet.com/elftmann-tactical-elftmann-trigger-ar-9-curved-adjustable-2-75-4lbs-mil-spec.html?_iv_availability=in-stock
The Blackout Defense Zero Trigger does not come with anti-walk pins.