This new update offers enhanced details about your Blackout weapon use in Combat Record, to the same level of detail you experienced with the previous Multiplayer update to Barracks. Plus, you’re now able to change and equip your Custom Class Loadouts as often as you wish, with updates to your in-game account in-between matches! Here are the information drops to check out:

Blackout Combat Record Barracks
Choose Blackout in the Combat Record tab and enter the Barracks, where you’ll now find a similar selection of statistical data for Black Ops 4 Blackout weaponry that was available in Multiplayer.
Weapons Stats - This defaults to the weapon you’ve historically used to deliver the most takedowns, though you’re able to see aggregated data for every single weapon available from all available types. Main stats are EKIA/D, EKIA, Headshots, and Deaths, with additional stats detailing Accuracy, Shots Fired, Shots Landed, [times you’re] Killed By, and total Damage inflicted. 

Loadout Editor
Also available today is the Loadout Editor, accessible from the Create a Class menu. Simply select the Custom Class Loadout you wish to manipulate, then pick the Primary Weapon (with Optics and Attachments), Secondary Weapon (with Optics and Attachments), Gear, Equipment, Perks, and Wildcards just like the in-game Create a Class menu; the App Loadout Editor features all the statistical and explanatory data, but offers a quicker way to swap out items, attachments, and other gear.
Taking the ICR-7 weapon as an example, you’re quickly able to swap out the Optics so you can pick between the six attachments on offer (Reflex, Recon, Holographic, Dual Zoom, Threat Detector, and NVIR). With Attachments, you also have up to six options (Grip, FMJ, Quickdraw, Laser Sight, Grip II, and Long Barrel in this example). MKII weapon variants are also available to inspect and augment.
The App menu also instantly shows equipment you’ve yet to unlock; tap an inaccessible piece of kit and you’re informed about the unlock requirements.
Where this Loadout editor becomes incredibly useful is between matches. Up until now, you could only change Loadouts in the Create a Class in-game menu, and many players didn’t have enough time between matches to swap out new equipment. Not any more: Now you can switch out loadouts on the app as often as you want, and between each match, any changes are updated, ready for you to use during your next match!

That’s right; you can control your loadouts from the App, and update them in real-time! Then, when you begin your next match, your loadout is automatically updated; in real-time during downtime, and after a match if you’re already engaged in combat.