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Lining up the trigger housing or the locking block, with the pre-existing frame holes on the 100% frames can still be a small challenge (like described by the OP), but it is easily overcome with a mallet, hammer, and/or punch (and might result in a sliver of polymer shaving coming off the holes).I was unaware of the serialized parts that puts a new spin on it for me. I have assembled many AR's with my own chosen components and that was the hope for a new Polymer 80 build. I will look again.