Pics of my No 5.

I finally brought my No 5 Jungle Carbine home. It's in need of a proper cleaning and I'm in the market for an upper hand guard. I made note of any markings I could find and thought I'd post them here. The rifle is a BSA Manufacture and was made in 45. It appears to be all matching except for the missing upper hand guard and the magazine. Here are some of the pictures of the rifle and it's markings.

https://www.milsurps.com/images/impo...rbine007-1.jpg
https://www.milsurps.com/images/impo...rbine001-1.jpg
https://www.milsurps.com/images/impo...rbine003-1.jpg
Matching bolt....
https://www.milsurps.com/images/impo...rbine004-1.jpg
This is right behind the trigger guard...
https://www.milsurps.com/images/impo...rbine005-1.jpg
Matching stock in front of the barrel band....
https://www.milsurps.com/images/impo...rbine006-1.jpg
This is on the top of the barrel just behind the nose cap. What are these marks? I know 303 must refer to the caliber.
https://www.milsurps.com/images/impo...rbine008-1.jpg
Base of the barrel.....
https://www.milsurps.com/images/impo...rbine009-1.jpg
It looks like there's a 7 on the left side of the butt stock....
https://www.milsurps.com/images/impo...rbine013-1.jpg

Looks very clean to me :)

The marks you ask about are UK civilian proof marks.

BNP = Birmingham Nitro Proof
18.5 Tons per square inch is the proof pressure.
303 is indeed the calibre
2.222" is the cartridge overall length.

Giving the old girl a cleaning today I had a close look at the non matching magazine. It's marked differently than the magazines in my No 4 and No 1.

Check these out....
https://www.milsurps.com/images/impo...rbine015-1.jpg
https://www.milsurps.com/images/impo...rbine017-1.jpg