I had a SOPMOD stock on my issued M4 the whole deployment in Afghanistan. I liked the cheekweld, but upon researching getting one for my ARs when I got back, I was immediately appalled by the $200 price tag. I was introduced to VLTOR stocks by LWRC, which come standard on all LWRC rifles (EMod, specifically). Doing the price comparison, I saw that the SOPMOD was $200, vs. the $100 for an EMod, and $75 for an IMod. I went with the VLTOR stocks, and I fell in love with the ability to store batteries in the stock without having to take it off like the SOPMOD. I use the battery compartments on my VLTOR EMod and IMod to store solid steel cylinders I had cut to the dimensions of a 123 battery. I use these steel cylinders to help balance the rifle. (Weird, yes, but it works for me) Of course when deployed, I used the compartments to store batteries, because I carried enough BS on my plate carrier as it was (being an RTO was miserable...) Anyway, what make these stocks so expensive? I like them, and feel the cheekweld is superior to the VLTOR stocks, but not $100 more superior. And what was the deal with the "B5 Systems" SOPMOD stocks that everyone was in an uproar about?