I'm looking to replace both the recoil spring and friction rings on a Model 11 that was recently handed down to me. I've spent some time hunting around on Brownell's looking for the parts, but am not having a lot of luck. They do however, have both rings and the spring for the A-5. I believe (and may certianly be incorrect) that certain parts of the two guns are interchangeable, but I wanted to get a second opinion before putting too much time into the gun. I apologize if this has been covered, but the Search function didn't seem to have the specific answer I was looking for. Thanks in advance for any help!