Bear with me here, but I think I see a way out of this madness.
First off, don't misconstrue anything I'm saying to over look barrel sales. Selling your barrels is one of the most exciting developments yet and should absolutely continue.
But (again, bear with me here) what about a modular ordering process for your rifles?
The menus could be something like this:
SELECT UPPER PLATFORM:
SELECT BARREL LENGTH:
>10.5 (5.56 & 300blk only)
>12.5 (5.56 & 300blk only)
SELECT BARREL PROFILE/ GAS SYSTEM:
>Light contour (PredatAR style)
>Heavy PST Barrel
SELECT HAND GUARD LENGHT:
>Stealth hand guard (13.2, 12, 11, etc.)
>PredatOBR hand guard (long, short, SBR)
>OBR hand guard (long, short, SBR)
WILL YOU PURCHASE A LOWER: