I had 2 P14s for my early days fullbore rifles at the changeover from 303 to 7.62. Both were modified for single load only and both had modified extractors to allow single loading ie ride over the rim once in the chamber, rather than engage out of the mag which of course there was no longer one. Never had any issues with broken extractors or failure to extract. These were very common conversions in the day.
On the other hand a mate with a crappy Alpine mauser (milsurp action), broke his extractor tip by not having the round rim engage under the extractor as it was fed fwd from the mag. Usually caused by not cycling the bolt with a bit of authority. The round jumps ahead of the engagement and the shooter doesn't realise this has happened.
The example above may risk breakage if not modified. All that plate may achieve is to defeat the empty mag hold back of the bolt which most of us just ground off the rear edge of the mag follower at an angle to overcome.
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