I dissagree whole heartidly and thank goodness for Eugene Stoner .
Anytime you lose your zero by beaking the action to clean or perform maintenance is an inherent design flaw. This is not an issue with the AR15 / M16.
I don't have any time behind the C1, and I consider that a great loss, however as a front line battle rifle by today's standards it is second rate. Sure the same can be said of the lee enfield, or the M14, but at least you were not required to break the action open in order to clean it. By 'breaking the action' I am referring to the rear sights being on one side of the break and the front sights on the other. Additionally the snipers had an optical sight fixed the the receiver.
This is why during NATO trials the M14 beat out the FN-FAL design handily in the long range accuracy department.
Riflechair, if one reads about the history of the Falklands War, the Brit Marines and Paras after their issue FN rifles were zeroed, they broke off the takedown latch to prevent this accuracy loss problem. Also got this info firsthand from a few really crazy members of "Mighty Munch" (M company) 42 Commando, Royal Marines, while in Cyprus winter tour of 1986-87, and training at the British Soverign Base in Dhekalia.
They cleaned these rifles from the muzzle end in the meanwhile, for the duration of that conflict.
{British irony & humor, Mighty Munch is an Irish spicy corn snack known to cause allergic reactions and other gastro-intestinal problems!?!?!}
Myself I carried an SMG (platoon signaller) for the last of the FN Era, until the C7/C9 came along. In 1988, we were the last regular force brigade in Canada to change over during the SARP program. (SSF/CAR in Petawawa)
I prefered the ergonomics of the FN, but I rarely had the opportunity to shoot past 500 yards, because this was not a requirment.
I presently own a Polytech, and I have full confidence in handloads with bullets over 150 grains in weight for accuracy.
This is probably where the FN was at a disadvantage for truly long range shooting.
The sniper issue Leitz 3 X sniper scope/mount for the FNC1A1, was hardly seen and even rarely used.
But in the army we had other tools for this. (the C3 bolt action sniper rifle)