I wouldn't do it. I have seen those things crack shatter and stop working all outside of a game scenario. Now that specific one I can't say 100% but unless you have held a similar product (same brand/replica of same value, this is chinese stuff...) I would not even consider it. To make things worse on you Swiss Arms is like DPMS, in airsoft someone else makes them (they are real brands for real guns) and it is not exclusive. The value of the item should reflect the quality/durability if your source is respectable.
Try these venues for upgrades and accessories as they are active on this sight, most of them.