BDM-4M2 long reload

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The BDM-4M2 has a long reload speed for the ATGM. Why is this? It also has the same BR of 9.7 as the original BDM-4 and BDM-4M, despite being worse, a lot worse.

Different autoloader iirc

Has the slower BMP-3 style ATGM autoloader (fitted to some BMP-3 models, not ingame currently) than the BMD-4 style one