IMHO: nope.
The extra $300 buys you the ability to make Target cards which could be helpful at some matches on some stages, which is cool… but if you have your G7 BC figured out (and you should) you don’t need the AB custom drag models.
If you have the loot to juggle and really run more than 3 long range setups than you probably have the loot to pony up for storing them with the upgrade lol, but even then, to me storing info on more than a few guns gets confusing so YMMV.