I have an FR-8, and like it. Accuracy isn't great, about 3-4" groups when I first tested it with some cheap ammo, but then it was the first time I shot it and I wasn't used to the unusual sights. I have improved since then, but it still aint no benchrest rifle. The sights do take a little getting used to, but I don't think they are "bloody godawful", - small, fairly close to the eye aperatures set at graduated distances combined with a hooded front post can be very accurate. Yeah, the combination of little rifle and metal buttplate does thump your shoulder pretty good.
When I bought mine I did some research on them and found some good info but can't remember what website it was on. Do a search here on it and you should come up with the links. From what I remember, the FR-8 should be good to go for any .308 loads you want to put through it, they are built on a 98 type action (mine is a FABRICA DE ARMAS LA CORUNA 1950) the FR-7 was built on an earlier action type and is questionable at this pressure level. Both were made in the 60's for use as reserve rifles, by rebarreling old mausers with CETME barrels (after NATO went to 7.62 standard ammo) and switching the gas-tube mount/sight assembly around to use the center hole for the barrel and the bottom hole to hold a cleaning kit tube which acts as the bayonet mount lug. Most had very little to no use after being rebarreled as Spain went through a major upgrade in their weapons in the late 60's through the 70's. Mine had almost no wear on the finish on the bolt, mag follower, or rails (it does now).
I think "scouterizing" an FR-8 would be more trouble than it is worth. To get a forward mounted scope you would have to get rid of the top piece of wood, which would then mean you have to get rid of the front metal, which would mean you would have to recontour the front of the stock, and would no longer have the rear hole for the cleaning kit tube/bayonet lug, which would leave the funky bottom ring of the front sight assembly empty and hanging down looking as bad as the bayo mount on an M-44. The sights stick up high enough and are large enough that they would probably interfere with vision through any type of scope unless you went with high rings which would raise your cheek enough to make sure it gets a crack when you shoot.
I would say that if the rifle intrigues you, go ahead and buy it, but leave it alone. Mine is my "truck gun", and is pretty handy just the way it is. These aren't a very common rifle, and it would be easier to make a "scout" out of a lot of other mausers. How much do they want for it? I have only seen one other FR-8 anywhere, and that shop wanted around $300 if I remember right, and I think some of the other guys here that have them said they paid about $250. You should be able to pick up a Yugo M-48 for less than that and it would be a lot easier to "scouterize" if you don't mind shooting 8mm rather than 7.62.
bergie