BSAco No3 SR info

I bought this a number of years ago and used it for 2 hunting seasons before "retiring" it to my safe. Lately ive been seeing truckloads of .303's hitting the market here and the idea of getting info about my rifle struck me. So please bear with me as im not the best photographer in the world but I think you can get an idea....
On the right side of the receiver it is stamped with the B.S.A.Co and on the left side it says No 3 S.R other than that there are tons of stamps on the barrel. The bolt on it is a bit of a mystery to me as I see a lot of them on here that dont match with mine.
Here are some pics of it. They arent much but maybe one of you kind folks can point me in the right direction for a history lesson?

https://www.milsurps.com/images/impo...100_0287-1.jpg
https://www.milsurps.com/images/impo...100_0288-1.jpg
https://www.milsurps.com/images/impo...100_0289-1.jpg
https://www.milsurps.com/images/impo...100_0292-1.jpg

I can tell you it has been sporterized and the overall length is 45"long. The barrel is 24 1/2" long longer if i have to include the threads into the receiver? It still has the 10 shot clip for it. If your wondering why there is an initial on the clip its cause my buddy has a .303 and we didnt want to mix our clips...lol
I dont know to much more on it. Hope you guys do.

So ive cleaned all the surface rust off using G96 that I got at my local sporting good store. My town doesnt carry brass wool, so i got the superfine steel wool instead. I sprayed the G96 on, left it on for about 10 seconds and with only light pressure with the steel wool, the rust came off. I did strip off the fore end stock but dont have a screw driver long enough to get the butt stock off. I found a "ton" of numbers and letters all over the underside of the barrel and such. These are my findings......

Underside of the barrel, stamped all over.......... C658, FDF, FDSE, FD9V, LFD98, S, R, P.

underside of trigger plate removed......... 4, 50

underside of bolt.........14844

top of receiver where bolt slides (possible serial number?)........12xxx S
funny thing was, when i registered it I used the number on the barrel (3261)

mag..........33570P

This was also crudely mounted to the side of the receiver with 3 screws and a ton of JB Weld. It worked great until the jb weld started cracking then it wouldnt hold true for staying sighted in.

https://www.milsurps.com/images/impo...100_0293-1.jpg
https://www.milsurps.com/images/impo...100_0294-1.jpg

I also have this on the Canadian Gun Nutz website.