Another BREN-fan (introduction)

[erik3D]

@SNAFU22
I've used a 4 MB .png of 2376x1836 pixels that I downloaded from your answer in the 'MK 1 Cycling issues' thread. A careful cleaning session in Photoshop did much to improve it, but there are still some blotches that I can't really read.
Here's a similar crop after treatment:

Is your original .pdf much better that that?
If so, I'd sure like to have it!

The other drawing crop you've uploaded is one of the few drawing fragments I've found here when I started this 'project'.
It looks like a photograph of a much clearer drawing, and of a slightly different version.
If only there were more pieces of that particular drawing to be found.
Better still of course would be a crisp, undamaged, high rez drawing of an MkI, but it seems none are available.

Here's a drawing with some of the dimensions I've derived from your Mk2/1 drawing (in mm's), combined with other parts I already had.
I've marked in red two areas where I think there should be some clearance to make things work properly.
Looks like the bolt I drew is a little bit too long, and it is pushed up a tiny bit too high by the bolt carrier.
This design doesn't appear to allow for much deviation from the theoretical dimensions of its essential components!
In practice that can only mean that, apart from the barrel and matching locking shoulder, you'd have to be very careful selecting parts (upper receiver, boltcarrier, bolt) to make sure they work together as intended.