problem with ejection for n0 1mk 3 and no4 mk 1

[boltcarrier]

What was the last thing done to the rifle prior to it failing in this way?

i bought these rifles a few months ago and never fired them, i figured that i should check out all the mechanics before using live rounds,

---------- Post added at 05:39 AM ---------- Previous post was at 05:33 AM ----------

If exactly the same thing happens with both rifles & you have tried the above & it has not worked, then as has been mentioned, perhaps you have a problem with your dummy rounds? If the rims are thick you may well have a problem opening the bolt. If you have any spent cases that fired, extracted & ejected satisfactorily through the rifles, try those, if you've not already.

so as suggested by some that i should use a mallet to hammer the bolt upwards, and that works but i sure would like solve the problem instead of having to do this every time.