Congratulations, that is one of the good ones--
What you have is an Inch FAL (also known as L1A1) made in Britain originally. You can tell by the furniture, the Gas block, and the UE (made by Enfield) lower stampings. That upper receiver is one of the good ones, it looks to be an Imbel (Brazilian military built receiver). The kits these were built on were often times very primo British kits and the barrels are often in excellent/almost new shape.
1- To un-sporterize the stock you will have to replace/restore the pistol grip stud, which was ground down to fit the thumb-hole. Not too hard, and there even was a guy on Fal-files that offered a service to do it for you if you are not too mechanically inclined. Look around Fal files of instructions on that job. Be aware of 922r will apply if you un-sporterize this one- and the US made parts are going to be a few bucks to get it done. If you don't know about 922r be sure to read up on it before starting to convert it back. The top one in this pic has had its stud ground down
2- You r barrel was chopped a few inches. You should have it re-threaded for the proper muzzle device, makes all the difference in looks and function. Moses over at Fal-files used to do that very inexpensively, not sure if he still does or not.
3- In terms of mags, yours is a metric receiver which often had the mag slot opened up for Inch mags by Century. Check the mag insertion area on the receiver where the magazine rocks in on the front to see if yours is Metric or inch cut. If you just have the little cut as shown in the pic on the right, you can only use metric mags. If you have the enlarged inch cut, you can use either, but metrics will sometimes be wobbly and may or may not cause an issue. This is a good pic that shows the difference (metric is one on the right)
And magazines, metric is on the right again.
Moses from the files makes some new manufactured ones that so far have been amazing in terms of fitting either metric or inch cut very well.
Moses Polymer mags
4- And it comes with the Trilux scope, very nice. Check the name plate on yours, if its in english its a British one. If its in Hebrew its Israeli. That scope alone is worth $350
5- and this is the thread you want to check to see what your baby will look like with some nice British wood (or even a nice pebble grain stock) --
Fal Files- British pic thread