Here are some other issues I found from the gun, as told by someone who is and had friends in the British Army and I beleve he served himself.
The early rifles had many problems; I have heard many horror stories such as that the plastic would melt when cam cream and insect repellant was applied, that the rear upper receiver and trigger mechanism housing were made of such poor strength that you could squeeze the walls together and prevent the bolt carrier from travelling down the recoil rod assembly. I have heard that the top cover was made so flimsily that it was common practice to tape it down to prevent it opening randomly during firing, even that the lack of a magazine release catch guard meant that the magazine would often release itself when making contact with your webbing! The list goes on....
The gun was made with simplicity in mind, bassed on the already simple AR-18 rifle (which seemed to have various problems when it was developed by Britian, but has not had any other issues in the past. The Type 89 and G36 rifles are both bassed on the AR18 and have had no issues as serious as those of the British AR18 and SA80).