Upon firing, as the barrel recoiled rearward and the empty case was extracted, a lifter brought a fresh round up into alignment with the breech.
As the barrel, barrel extension and bolt, which was riding inside the sleeve, recoiled, the sleeve and barrel rotated to unlock the bolt.
Upon ignition of the primer, the barrel and bolt recoiled together for approximately .
If that recoil block is completely split out and recoiled
to the rear, gently drive a wooden wedge down into the stock's magazine mortice, to spread the sides sufficiently, to allow you to press glass into the splits.