I was reading Troy's magazine FAQ and I was hoping he or someone could answer a couple questions. First, I recently bought a bushmaster 10rd steel magazine that they call their bullpup magazine. any idea who makes them for bushmaster? It is a very well made magazine and it performs better then other magazines I have used but the floor plate is not labled. also, I bought their 30rd aluminum magazine and when I compare them I notice differences at the top of the magazine where it feeds from. the top forward and top rear part of the 10rd steel magazine are rounded off, while the 30rd aluminum is fairly square on the edges. whats the difference between these two designs? I would really appreciate any information you could give me. thanks. -Chris