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Is it actually trying to feed 2 or is it failing to extract the round in the chamber ? ie, does it happen after inserting a fresh mag or after you have taken a shot or two.
(picture taken form the 10-8 forums)
Llamas are a pain, some parts from 1911's fit with no issues but there are some that need a bit of massaging to work, I have a list here somehere, I'll try and dig it up.
The XI-B seemed notorious for this problem - stock mag can be made to work better by opening up the lips but the mag follower/barrel ramp path is still problematic with anything but ball ammo. Wilson mags worked for me, Colt (or Colt knock-offs?) worsened the feeding problems.