Functionally, none, besides the cost difference which tips in Vltor's favor.
The SOPMOD is longer, but you have to remove the stock to access the content in the storage tubes, whereas with the Vltor, the caps can be removed to access the content in its tubes.
IMO, the SOPMOD feels more durable. SOPMOD also weighs more and the cheek weld area is a solid slab, not sectioned like the VLTOR. Some people complain about ripped facial hair w/ the VLTOR stocks.
For those of you that have tried both extensively, is there a big functional difference between the Emod and the Sopmod? If you prefer one or the other, what is the reason?
I believe the Emod is longer. Is it heavier?
Any large differences in the slope of the cheekweld?
I don't have much facial hair so the cut-outs on the Emod don't matter to me.
Storage is different, but similar...
They have bad information. Even after I explained that there are no laws regarding sending parts like stocks, she said she'd "check with ATF"
Which is just fine, they don't even have it in stock. My order sat there for 10 days and I never got any notification about its back order status, there's another vendor I won't do business with.