Deploying to Iraq soon and I just bought a 551 EOTech to bring with me. I will be putting a LMT rear site on the flat top with the 551. I'm reading alot about the LARUE EOTECH MOUNT being a good purchase. My M4 will have the fatter, double heatshield handguards and no rail system. Is there enough room on the flat top with the Larue, LMT and 551? Or am I going to have a problem with the handguards getting in the way?