They will be tailored to the individual. A grenadier will get the 203. Not everyone needs the bipod. A designated marksman will get a scope instead of an Acog. Ect...
They'll be customizable just like any rifle. You can take whatever you want off as well. Some guys didn't like forward grips and grip pods and took them off they M16a4's. Some guys didn't like the issued sling and took it off and used 550 cord instead. Others used their own slings. Nothing is permanent for weight other than the rifle itself.

