Wow, I love it!! Thank you for preparing that!!
I have info to add about the former H&R factory in Worcester, MA. This is a good story that I rarely think of because it was so long ago, and you want to read to the end to see the surprise.
I grew up in the area and know it very well. There were functional remains of the factory until the late 90s, when it was all leveled. Most was demolished, after gradually falling down, when Walgreen's was built around 1995-ish.
From the 80s to the 90s, portions of the building tumbled slowly, but much remained in use. A tiny portion on the northeast corner was an auto body shop, and the rest was rented out as large item storage (boats, cars, machinery). The auto body place was gone by 1989-90. So many walls had fallen in by around 1993 that the building was abandoned. Vandals and thieves stripped it of anything of value fairly quickly, and it became a hangout for junkies. My brother and his friends went poking around there after a game at Foley Stadium once, and encountered some "crazy people" as he described it.
Circa 1995, a friend of my brother's was working for an Egyptian national who owned a demolition or construction company. If memory serves, it may have been run by the Aswad family, who owned and operated the "1 Prime" or "Valu" gas station a short distance up Chandler Street at the time. They were tasked with tearing the building down to the ground. It was an ordinary, boring, dirty job, until one of the workers broke into what was described to me as just a normal wall, and found a tremendous cache of NOS gun parts from H&R and Iver Johnson. They made the mistake of getting all excited, and the owner of the demo company found out, and came along and took every single gun part, and they were never seen again. Trust me, I did my best to track the things down, or at least try to learn exactly what was found, but the guy I know who was there is not/was not a firearms enthusiast so he could barely describe what he saw.