Rangers Weapons;
I have a book about the Rangers (from 2001) and I have not seen a single picture of a M4 with reflex or ACOG sight. All m4's were equiped with red-dot sight. Now, this may have changed a bit in two years (and I'm sure that the choise of optic is also based on the mission), but you might consider making a m4 with red-dot sight.
Also intersting to add is the Stoner SR-25 7.62mm self-loading rifle (I think it is sometimes called the special purpose rifle). This a very nice rifle for short-medium range sniping. (it was introduced to the rangers around 2001)
Ill answer what i can:
Firstly the 75th rangers now have the ACOG Reflex as standard issue, the aimpoint went out of fashion as soon as these more 'open' sights came out, though the aimpoints were used a little for nighttime operations (although the eotech 551 is now replacing it there), we originally did have an M4 with Aimpoint but removed it due to reality and file size reasons.
Onto the SR-25, we do have one made and plan on introducing it to the next update. However its not sometimes referred to as the Special Purpose Rifle, that title belongs to this baby:

(Seen there mounted with just about every attachment under the sun, the object just to the left of the foresight is the Eotech 551, which is becoming very popular among SF)
The M4 SPR is as accurate as an M24 out to 800m and we have taken this rifle into consideration, you will have to wait till release to find out if we make it, but there will be one more sniper rifle going in that hasnt been mentioned that is in production at the minute.
One thing to bear in mind is that two years is a long time in the SF world, a lot of new products are introduced and become popular/unpopular. Also books may have been made even earlier than stated...so basically, dont worry about telling us technical info we know most of it already and up to date from our man down in fort benning (home of the 3/75th rangers)
And yes, having 'grenade bags' or something similar was mentioned, but there wasnt time to implement it before release, there were a lot of things we wanted to add but didnt get the chance...
And i believe vixer has plans to redo/texture the M240 as i have done with the M249, so that problem should be fixed then...