Quoted: Don't they have the larger Colt 0.315" pivot holes instead of the .250" that 95% of the lowers have. If so you need the larger hole colt pre-ban lowers.
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If they really were SP1 uppers, you'd be correct. They are NOT SP1 uppers, and I'm darned if I know why CDNN keeps listing them as such. They are, in fact, M16A1 uppers, and as such have the regular size small front hole, and can be used w/o any mods on any current lower. By all accounts, these are units that were removed from new, unfired, M16A1s, that were being upgraded with A2 type uppers
While I didn't get one of these units, I did get one of the stock assys, bolt/carrier assys and charging handles that were part of the original offerings. They were exactly as advertised. You could see that they had been mounted, and you could also see that they had never been used before they were taken off the weapon.