I added a page tonight for the Colt Prototype SP901/LE901 Upper Receiver. You can see detailed images here: https://thecoltar15resource.com/colt-prototype-le901-308-upper-receiver/

Mail call today was an unusual item for the collection. This t-shirt (size large) is promoting the Colt ‘Sporter’ rifle with the tag line ‘Sporter Supporter’.

The ‘Sporter Supporter’ statement gives me the impression that this t-shirt was produced sometime during the period of the 1994 enacted assault weapon ban.

I do not know if this was an official Colt licensed product or if it was an independent commercial product.