The reddish shellac over the sanded hand guards and metal bands, deep pitting on all metal surfaces (especially under the wood) and general loose condition say "Vietnam" to me. These arrived in Canada many years ago after a temporary "seizure" in Seattle, if memory serves me correctly.
It looks like the lower stock has had the shellac removed. These were the left overs from the ARVN and RF-PF, stored for years under poor condition by communist Vietnam after the collapse of the South.
Like any rifle with no providence, do as the above members recommend. Have it thoroughly checked for safety and head space. Minimally, you will require a new operating rod spring. Most that I saw were old, rusted, bent, short, missing a few coils, or all of the above.
The trigger group should be tested for function and safety. Consider replacing the hammer spring.
Check the rear sight for tightness also. Run the sight all the way up to the highest position (after having stripped, cleaned and correctly tensioned it) and push down on it with your thumb. If it falls down, then the range drum needs replacing. Make sure the splines are not worn too.
All the stocks were heavily sanded, many had cracked hand guards. The fitting up of the receiver to the lower stocks were completely compromised due to heavy over sanding. Check the rear of the receiver tang were it contacts the wood stock. If it is not touching, then scrap the stock. If the trigger group locks up with no resistance, and the entire receiver moves in the lower stock, then scrap the stock. Unless you are very good at glass bedding, it might be salvageable.
If your gas group is worn and loose, the hand guards rattle away, the receiver group moves in the stock, and the trigger group is in rough condition, your accuracy potential and reliability are going to be poor.
Most of these rifles were in horrible condition, and should have been scrapped for parts, maybe. If you invest enough time, money you might be able to restore it to a rack grade shooter. Wolff Gunsprings, and Boyd's Gunstocks are two places to check out for springs and stocks.