The first issue sounds like the "S" arm is overriding the main spring hook. Elevate the muzzle a bit, pull the receiver forward until the "S" arm clears the main spring hook. Then gently slide the receiver back and watch for the "S" arm to engage the hook. Replace the side plate, place the muzzle against a soft pad, push the top assembly rearward against the spring pressure and raise the locking block into place.
If the top assembly gets stuck to the rear, it's a good indication that the "S" arm is NOT engaging the main spring hook. If properly engaged, pushing or pulling the top assembly rearward will be against spring pressure.
It is not necessary to retract the toggles in order to rotate the locking block into position. Simply push the muzzle against a soft surface to move everything rearward. For short barrels, I hook my fingers in the trigger guard and place the muzzle against my palm and squeeze.
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