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Not sure that's an apples to apples comparison but it does offer the same level of confusion. The Spikes lower has a model designation clearly listed on a separate line. "SBR" is not the model number where the QC10 lower has "CLT9MM" stamped once on the same line and serves as both the model # and as part of the serial number. Pretty jacked up way of marking the lower.
But to your point within the Spikes example, knowing SBR is part of the serial number, does that make the model "MOD-ST15" or is it just "ST15"? (rhetorical question) go figure. The same could be said for the caliber. They just didn't think through how the markings could be interrupted.
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Model is definitely just ST15.
The reason I said it was the same thing is there were forms approved both ways, and forms Disapproved both ways...not necessarily because the confusion was identical.
The dumb thing about the Spike's situation is if was SAR or SCR, it would've never been an issue. Some knucklehead examiner(s) decided that SBR must've been intended as a label, like MOD and CAL.