What the... I didn't know that TakaraTOMY had reissued Ultra Magnus. There's no mention of a MP Magnus reissue on:

TakaraTOMY's Official Masterpiece page
TFwiki
TFU.info

MP Magnus was released in 2005 well before the Takara merger with TOMY and only features the Takara logo like this:


I suspect that either:
1/ This toy is a KO.
2/ It's a very new reissue (because TakaraTOMY's MP page has MP Thundercracker there, yet no mention of a reissue Magnus) and it seems that Tomy might've dropped the ball with QC on the reissue with your figure.