Bren 3/1

[Lee Enfield]

All Bren Mk3 were new receivers.

A mk3 is a stand alone receiver between MkI and Mk2.

A mk2 receiver can be lightened to be similar to a mk3, that was referred to as a Mk4.

The mk3/1 is a mk1 receiver (not a mk3 at all) which has been lightened in a similar manner to a mk3. So far as i'm aware it was an Indian innovation.

"Mark" designations changed from Roman numerals to Arabic numberals in 1944/45. This might be causing some confusion as they were used interchangeably and with some overlap.

Www.bren-gun.com has drawings which can explain the progression.