There are three internal parts to watch out for if you use it regularly. They *will* break with regular use, but they're also largely cosmetic and don't really affect function at all.
1. Loading nozzle arms
2. Loading nozzle return spring
3. Safety block - it's not uncommon for the "wing" on the side with the physical internal safety latch to break. You won't notice until your safety stops working properly. It *is* possible to make it work again simply by removing the broken piece, depending on how it fractures.