Upper receiver lug widths are 0.496" (-0.003")Sure. I got the calipers out last night, and the recess for the rear lug in the lower receiver is about 2.5-3 thou smaller than the rear lug on the Ridgeline upper. Still have a few lowers to check on the off chance, but the ones I had in my bench/shop area were as mentioned above.
Like it's DAMN close...like I could probably thermo fit and persuade (i.e. force with rubber mallet) it into place, but knowing how both of these are notoriously tight, I might just hold tight (no pun intended) and source a lower that's not ridiculously tight as fuck already.
Lower receiver takedown
Dimensions are before finish. MIL-A-8625, Type III, Class 2 anodize thickness is 0.002” ± 0.0002”. Roughly, 50% of that thickness is "penetration", 50% is "growth".
So taking into account anodizing thickness, max lug and min pocket can both be 0.498" (not taking into account anodizing thickness tolerance)
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