What version was the run completed on and is there any chance you can include it in the rules?, There are some huge difference between my retail version and the current world record video.

Menu Splash at the start of the run says MP-3 and is clearly not retail, I Just would like to know the version so I can try a few runs myself, Trying to match the pace on retail is hard considering the differences I am noticing.

From what little information I could drum up it seems all the runs have been completed on the 'Mektek' Repack of the game, Specifically Mek Pak 3.

https://www.sarna.net/wiki/Studio_MekTek,_Inc

From my understanding it is impossible for someone to get there hands on the repack from Mek Tek these days due to legal reasons.

Just thought id give everyone a heads up, While MW 4 Merc's retail can still be purchased via ebay and old games listings the Mek Pak 3 version cannot be downloaded without breaking laws.