Remember Lucky 15 barrels? OEM'd from SP.
The older Planet Eclipse Shaft barrel kits? Used to be from SP.
I remember one hater who was in the shop, ranting about SP and saying he would never give them any of his money. He pointed at a Freak Insert Kit in the display case and said "I bought an Eclipse Shaft Kit instead". I turned and faked coughing to suppress my snickering...
Yes, they did make a variety of items for other companies, though none of that really matters anymore
(For the record, I loved the Ion and Vibe/SP-1 but was 'meh' on everything else!)