Not really, the AFV lower hull was designed for the Hobby Engine Abrams and its been around for about six months, before that there was another Abrams lower hull for the Kyosho/Hobby Engine Abrams but that company no longer makes that product, here is a video from tomsrctanks http://www.tomsrctanks.com/M1A1.asp showing that M1 using the earlier lower hull, along with some other mods that Tom made to the tank.

Will