A few things..
1. Parts are pretty hard to find, so make sure it's complete. Some parts like the handguard, which is pretty fragile, is practically non-existant on the open market.
2. The gas system, especially the gas valve can be seized up, and fairly temperamental, either use a custom wrench or doctor one up to fit and adjust. NO TURKISH AMMO!!
3. Bore condition should be checked. Mags can be finicky, and expensive, most aftermarket ones need feed lips adjusted, factory ones can need adjusting to suit a particular rifle.
4. Garand thumb has nothing on Hakim thumb.
5. Bayonets are pricey and uncommon.
I've seen prices between 750/800 for a rough one to over 1300 for a very minty nice one. Actually, Egypt bought the design and all the tooling used to build the AG m/42 from Sweden to build it.
Like shooting a 10 pound railroad tie...