The C7, or C7A1, or C7A2, all get the job done. Yes, it sucks, and you have to tuck the butt right into your shoulder regardless if it is a A1 or A2, but you deal with it. It can be done, and I think it is good for new soldiers, because the barrel length is so long it teaches muzzle control before moving onto shorter weapon systems if you move onto them in your career. The C8, or A1, is superior, and if your on a reflex shooting range all day, you appreciate the weight reduction.
In the end, everything has its trade offs, and it is nice to know if you step back outside you have that added range with the C7.
In the end it is all what you know and train with, and like I said, there is no such thing as a free lunch.
Its funny, I seen an old training video while I was in, and it was British Infantry troops doing room clearings with full size FN rifles.
Hey, I never went over to the sandbox, but I was in, and the C7 and C8 worked for me and my friends very well. I even seen C9s and C6s used, hey you just soldier on. My experiences were with live ammo, blank ammo, and yes, sim ammo, in a variey ranges all over Fort Lewis (A freaking massive base might I add) and all worked well. It was more about what you did with what you had than what you had.
It would be nice to have a C7 and a C8, or seperate uppers, but that is to much ?%?&% carry and you only need one gun, besides only Rambo carries more than one gun.
And yes the Good Old Elcan. Well I seen only one problem in my time, yes the first gen lose there zero all the time, but one guy we pushed up through a window frame and it peeled the rubber right back on his Elcan. They are heavy, but rugged with the exception above. Irons are better, and all the old guys always grabbed old school C7s or C8s and always out shot us young guys. The Eotech is great, and it is light weight, but on a Winter Ex you would burn through batteries.
So, on that last note, there is so such thing as a free lunch.
I hope this answered your question abit.
Happy Shooting Shooters.
p.s. And live ammo in a closed room, and the rooms we were in had open ceilings so instructors and saftey staff could walk around the top of a catwalk and watch us, it is really really really loud.