Growing up in 1950s Baltimore we all had Model 25s except the kid whose family owned the hardware store and funeral home.He was a good friend though because he kept us supplied with BBs, even though he had a Bluestreak.Where we went the Model 25s went.Yes, to school.The teacher would line them up behind her desk and we could only have them at recess and after school.They were plenty powerful for us and on the rare occasion when we all ganged up on a squirrel, it would succumb to the many BBs.The Model 25s back then did not have trigger dis-connect and you could hold down the trigger and pump away.Sometimes we felt the need for speed and would field strip the rifles, stretch the spring to about three feet long and put it back in.We had magnum power for about 15 shots then we repeated the process.Foolishly we sometimes put a few drops of my grandmother’s sewing machine oil inside the compression tube. Whew were lucky none of the rifles exploded.However, to answer your question, as I recall, the 1958 Plymouth Model 25’s had round springs.I think it was shortly after that Daisy moved to Rogers, AR.Stay safe and…free.
Well, the stock had become broken (Plastic) several times and was mostly electrician’s tape.It accumulated lots of rust from the Southeast Asia climate (I had to work sometime 😂).Somehow it kept getting shorter and shorter.I did speak to a fellow in Arizona about re-building it.He advised me to let it go, so I did.I found another one from Plymouth but it was in bad shape internally.I bought two of the Chinese 25s, one for me and one for my killing partner in Kansas.He loves his.I sent mine back without even shooting it.I found a really nice later model from Arkansas. It shoots great and fits just right.