I think it's the Raising Cane's or In-N-Out Burger formula: don't mess with what works. No need to add things if what you're doing is working already.Or, it seems like they didn't really want to do anything other then build Glock pistols but we're almost forced to do a build for government contracts.
However, the fact that they've spent YEARS on this makes me think there's something special that they're not telling anyone (publicly, at least).
