lazi, I have a remington speedmaster model 552. It's got a mini shroud over the ejection port. I used one like it that belonged to a friends older brother back in the 60's. I'm not sure when mine was made thought. Nice rifle. 22 short, long or long rifle! Not many of those around today!
A Little Paranoia Will Keep You Safe (ALPWKYS) Be a Sheepdog JYD#105