SA80
The LSW variant is far more accurate than its predecessor, and is used in army FSGs (Fire Support Groups). They are amazingly accurate for their size (Army marksmanship tests were redesigned after the SA80 introduction because it was so accurate). Nevertheless, the SA80 family has been plagued by poor reliability. They have had an upgrade by the German arms company H&K when it was British owned. This resulted in the A2 series, but not all models have been upgraded.