Well MSH may have more on this than I, but to my knowledge there are only two types of AR-10 types (not AR-10s) that have the uninterrupted top rail....KAC's SR-25, which you may be able to buy on but not sure it would fit...better check on that one...and LaRue's OSR, oops
just checked....LWRC as well,.....here are the links.
larueosr.com/laruetacticalstealthosropti...omplete762rifle.aspx
www.lwrci.com/p-120-repr.aspx
www.knightarmco.com/images/sr25.html
as I said not sure they will inter change with the AR-10.
Personally I really don't see the need for it, as far a increased accuracy, the full rail has no effect to my knowledge, I may be wrong on that. Being you are building a Carbine, just my two cents, I really don't think it is necessary to go FF, now for the longer barrel I would say maybe, it depends on how accurate you want to be. Does it have an effect on the MOA, I have read that it can be so small that it was not worth the extra $$$$$ for a FF.
"""""EDIT"""""" unless you are shooting out to 800 yards and then some....
As I said, I have pulled down sub-MOA at a 100 yards with mine, so my friend you have to be the judge on that one.....I think you would do just fine with the two piece drop in railed fore arm...
As for the suppressor, it should come with a flash suppressor that the suppressor attaches to, depending on which one you buy...MSH can shed more light on this one.....And as for your CO, tell him that it never hurts to be multi-trained, it actually make you worth more in the field, you can fix bodies and weapons....now that's a MEDIC..
BMS