guns

The original A1 was rife with issues, but that was more-so due to incompetent manufacturing than any fundamental flaws in the design itself, and most problems were addressed with the A2 upgrade program. The actual design is mostly just a bullpupped AR-18, so mechanically it's perfectly sound.

The only thing that I would say is an issue is weight - the rifle is nearly 5 kilos, part of that is the scope, of course, but even that's only about 420 grams, so this still leaves you with over 4.5kg for a 5.56 rifle with a ≈20″ barrel - for comparison, the M16A2 is 3.4kg, the SG-550 is 4.1kg (both having barrels of similar length), the FNC is 3.84kg (with an ≈18″ barrel), and the FAMAS and Steyr AUG - both also bullpups - are 3.6kg. I assume this mostly comes about from the really big receiver - if you look at most other bullpups, they tend to try to make the actual metal receiver bit as minimal as possible, and use polymer for the rest. For example, the QBZ-95 (the FAMAS is also pretty similar) - the carry handle, the upper and the pistol grip & handguard section are all polymer and pretty light.

Or the AUG, which has a rather atypical receiver that actually sits mostly ahead of the chamber - it's the section with the scope on it. The stock is all polymer.

Conversely, on the L85, basically everything behind the green handguard is metal (there's a few other polymer bits, like the pistol grip and the buttplate):