That’s the biggest reason parts won’t fit correctly, especially slab sided parts. I recall over the years reading about folks having difficulty with DML’s MLRS kits, and also their Scud. Never had problems with either. Plus I use an Opti-Visor to inspect every gate location, although the ultimate fix is just test fitting everything.
In other instances, depending on the part, a piece of granite for sanding flat parts helps. It corrects small molding errors, mold seams, and sometimes even the tiny protruding lip around a knockout hole. Sometimes they’re even raised a bit. I check all of those as well. And finally, if it has alignment pins (barrel) I generally just trim them off. More often than than not they prevent the two barrel halves from getting a tight fit.
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