I saw the progressive mods to the SA80 come in and each time something new developed after lengthy firing. It is a story all on its own and one I'm not going to lengthen by pretending it didn't cause grown men to cry in frustration, I'll leave that to those who got their hands dirty in quick time to try and resolve ALL the issues!!
I remember as if it was yesterday, handing in my issue SLR and drawing out an SA80 for the first time, and all the pain barriers of dry handling and lesson plans, completely foreign to many, even after they gave the lessons. It took a long time to be accepted as the replacement, so you can imagine what was being said when it started going miserably wrong, compared to my trusty steed the SLR IMHO.