FIE was an imported that imported inexpensive guns from Europe. They were banned from import in 1968 due to them being unreliable and cheap. On a good day it might be worth $100.
25-160 USD depending on specifics
25-75
10-80 USD or so
No published sn data.
25-56 USD
FIE was an importer of German and Italian firearms, among others.
10-60 USD or so
How much a mod RG 14 cal 22LR is worth will largely depend on its condition. However, you can expect to pay or fetch in the region of $25-$60 for one of these firearms.
If you mean a Remington; 100-400 USD
Could be German, Italian or US
20-100 USD or so
50-500 usd