Was it a marketing strategy to keep “ made in Germany “ off the rifle ...?
Courtisy: Full Circle
It’s been labeled a T223 mag because all of the known pictures, at least that I’ve seen of the T223 rifle, have only had this style magazine pictured. Chronologically it would of been the only magazine available at the time the T223 rifle was petitioned for the SAW Trials, hence T223 magazine.
Its safe to say the curved .223 magazine appeared as early as 1966 since its pictured in the ‘66 manual I posted. The early style 20 round mag pictured, I assume, was still offered until HK discontinued it and stayed with the curved magazine design.