Ok for now - Thermold FNFALM10 FN/FAL-Metric 308 Winchester/7.62 NATO 10 Rd Black Finish

Rifle - DS Arms SA58 (metric FAL)

Mag does feed OK, BUT - reasons for downcheck.
1. Mag well fit is quite tight. On the plus, there is no rattle. The negative is, you really need to want to load or remove this magazine. To be fair, this may improve with wear over time.

2. Empty magazine does not actuate bolt hold open

These are range magazines IMHO. Since it does load things that go bang, and given the current lack of alternatives (10/20), I will keep these with the intent to replace them with better alternatives ASAP.