Bren locking shoulder size question

[Peter Laidler]

To be really honest Lima, you are asking the same question that Armourers have been asking since pontius was a pilot! The truth is that while there was a theoretical dimensional sequence, it really bore no relation to numbering as we know it on this planet.

This is what we all had in our workshops and I'm sure Tankie, Son and Skippy will (hopefully) agree with. We had a large partitioned tray and the locking shoulders were placed into the relevant partition based entirely on their measured LENGTH and NOT on the size indicated on the underside.

I suggest that you get a selection of locking shoulders, forget the number thereon and select the one that gives the correct CHS of between .064" and .074". You won't need to have one ground as they are fairly easy to stone given a bit of care - or better still, and don't tell anyone I told you, but just stone the rear of the breech block locking bent to suit