You can convert the bolt/carrier to semi auto, some small parts interchange. IIRC, stock is FA and can't be modified to SA. Same with the FCG box. Made in Malaysia under license so not Austrian made. Also has no provision for LH ejection although a replacement stock likely would fix that.
As mentioned, no regular source of semi auto receivers, some do show up on gunbroker and other places but cost around a grand last ones I saw. Bbls are damn expensive and rare, a cheap used one is almost 2 low end PSA AR15s. By the time you pieced one together from parts sourced singly you could have bought a factory AUG and a PSA! OEM mags are expensive, but Magpul does make aftermarket ones under $20. These take the Austrian proprietary AUG clear waffle mags, you need a NATO stock to take the AR15 magazines but the stock needs replaced anyway...
These have been around since at least 2019, and the price keeps dropping. I would assume due to lack of sales, for the reasons above. The Malaysian ones are also said to have been run hard, lots of wear and chewed up stocks.
Of course I thought the CETME L would never get aftermarket receivers due to the low number of kits imported and was dead wrong about that. So I grabbed one, at least one guy over on weaponsguild has managed to make one work so who knows? Of course with my luck next week they are going to be $99.99...