No. 4 barrel gauge

[Peter Laidler]

Then I would venture to suggest that it's the original .303" MUST-RUN gauge for the No1 rifle. Quite why it's shaped like that is a bit of a mystery to me. The threaded end was so that if it did get stuck in the bore, then you could send the rod up behind it, screw it in and withdraw it instead of trying to push it past the obsruction!

The other one is the bog standard .040" - .050" striker protrusion.

One point that people don't seem to understand is that because a gauge is designatede, say, GAUGE, PLUG, No2 etc etc, that it's for a No2 rifle or a pistol. Nope..... It means that previous to that, there was a GAUGE, PLUG, No1

They all have what we call an SM number for stores purposes. So the stores number would be something like B2 (something associated with rifles) SM-123. The first two digits, such as B1 or B2 indicates the actual stores category. There, another little bit of useless Enfield info!