No recoil buffer, but I did eventually suspect I’d twisted one of the interlocking steel “U” spines within the spring. Sure enough, when I removed the spines one was twisted out of shape. When the recharge handle was pulled toward the locking notch one spine hung up on the twisted one. I removed both spring caps and the spines, straightened the steel “U” spine and replaced everything. Now it works perfectly. I think the spine was twisted out of shape when I rotated the “claw” end of the spine to remove, then replace the cap w/ the new stainless cap, as suggested in the M^Carbo video. Moral: Don’t twist the spine more than a 1/2 turn when removing or replacing aspring cap! Thanks for your thoughtful response.