Well, your pictures don't show the loading type, so I googled the gun (note - no "y" in Ralock). Interesting gun, the action is not like the Browning SA:

THE B.S.A. RALOCK and ARMATIC REPEATING MODEL RIFLES

Historic Arms Resource Centre facility for British and Commonwealth Enfield and other Miniature calibre training and small-bore TARGET RIFLES (BSA- Birmingham Small Arms Co.), conversion units and accessories with representation of other nations' training rifles, plus Postal League competitions...

www.rifleman.org.uk

The BSA Ralock – The Shooting SHED Journal

shootingshed.co.uk

You can even get a copy of the flyer:

BSA 1947 -.22 Ralock Self Loading Rifle Flyer - Cornell Publications

BSA 1947 -.22 Ralock Self Loading Rifle Flyer2 pages, about 8 1/2" x 11" (no cover). New COLOR re-print restored and digitally enhanced from a nice original. Printed on high quality 20# 97 bright acid free paper. Fully Illustrated.We are not affiliated with any arms or gun manufacturer.CONTENTS...

cornellpubs.com

There's even a thread from 2013 on this forum:

BSA Ralock

I like old guns and oddball guns. Leave it up to the British to come up with this oddball design. The Ralock is a semi-auto that fires from an open bolt. It had a short lifespan. It was introduced in 1947 in .22 Short. .22 LR was added in 1949 and it was discontinued in 1951. This one is...

www.rimfirecentral.com

 

Thanks I corrected the spelling and the information is great.

 

thats a very nice looking rifle i know nothing of , but i like the look of it

 

These are very rare little rifles. It’s one of my favorites to hand to someone and see the blank look on their face when they realize there isn’t any ejection port or a charging handle.
They are a machining nightmare for manufacturing them. I can see why they never found a place in the market in that time.
theynwere built in 22 short only as well as 22LR. I have examples where the venting slots in the case capture box wasn’t done yet.
Neat rifles for sure. I’ve only seen a few in the wild and bought every one of them.

 

Thanks I guess I found one you did it buy. LOL

 

I have one in 22 Short. It's similar to a Browning SA22 in some ways and very different in others. The general shape is similar, the magazine and feeding is similar. The fire control is completely different. The Ralock fires from an open bolt. The bolt is like a huge hammer that pivots from the bottom. It's a take down like an SA22, but the mechanism is different, there's a lever on the top of the receiver that is lifted and the barrel comes out. Fired casings are ejected out the bottom, but are captured in a steel cup in front of the trigger guard.

It's not surprising that the Ralock is rare. It has some significant issues. Because the shell catcher cup covers the breech, there's no way to tell if a round is chambered, which is a safety issue. Like most open bolt guns the trigger pull is heavy because the trigger is under the pressure of a spring stiff enough to handle recoil forces, not a much lighter trigger spring as is the case with closed bolt rifles. BSA can't possibly have made money on them; there is a TON of machining on the bolt alone. There is no adjustment mechanism on the takedown. When it wears, you're out of luck. Finally, on early models the fired casings are trapped in the cup with no ventilation, so the gun gets dirty in a hurry.

All that said, it's a neat little gun even if it does make you scratch your head why it's made the way it is. Mine's not for sale.

Here's a video about them, there's pictures of the fire control and bolt at 2:30

 

I also have one in 22 short. I love shooting it. Trying to find a back sight for it.

Always looking to buy another Ralock if anyone is interested in selling

 

What are these Ralocks worth in the 22 short version?

 

not sure you will get a response - this thread is quite old , but good luck in your search

 

The tube is aluminum with a very long spring inside. I suspect yiu will have to experiment with the spring type. Good luck I hope this helps. You may search for gun parts in europe since that is where most of the remaining guns reside.

 

Yes if you are only missing the tube the stud should be in your stock.