I just recieved two El Gamo rifles from my neighbor to check out for him. Froma search, I found that it's an equivalent to the Daisy 131. Now I'd guesstimate that these rifles are close to 30 years old, and wondered if they have a leather seals (main spring seals), or if synthetic seals were available at that time. I chonyed one of them and it was hitting around 400-425 fps.bothhave identical looking power-plants, with a slightly different stock, and one hasthe octogon 'feinmark' emblem stamped into the breech block close to the serial #. Both are very smooth cocking without anyunhealthy sounds coming from them. Of course, they both need some TLCon the outsides of them,...rust, worn varnish, dents and dings, etc. Any info on these rifles would be appreciated, Thanks, tjk