Is the Bren designed for the carrier to make contact with the buffer piston every shot or was this buffer for over-gassed ( setting #4 ) operation ?

If the Bren is running 100% on gas setting #2 or #3 does the carrier contact the buffer each shot ?


Looking thru my various to do parts sets some buffers show contact while others little at all.
Makes me wonder how the gun is designed to operate.
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