Not bashing the OP, as this is pretty common.
It's an example of why 'custom' does not always mean 'better'.
With this, custom often means 'departed from gunbuilder design'.
The gunbuilder being factory, or another gunbuilder, which is NOT a gunsmith.
GunSMITHs fix guns, they don't design them (unless they are also gunbuilders).
Most of the better gunsmiths stay busy & don't have time to properly design, build, & test new designs.
GunBUILDERs focus on just that, and are not machinists or stockmakers(unless they happen to be).
Most of the better gunbuilders stay busy and don't have time & resources to be the best at making all things individually.
Stockmakers make stocks..
Machinists make parts..
Bulltsmiths make bullets..
Scopemakers make scopes..
Etc..
Bringing it all together into a proven design, and building guns to plan, is what gunbuilders do.
So many shooters go to the nearest gunsmith & have him make what they 'want'.
And while it's likely neither is knowledgible in designing guns, the result good or bad will be referred to as a 'custom'..
Most start off as donor Remington actions (gunsmith's friend), and merely depart from gunbuilder design.
Oops, that's a rant..