What are these thingies called and where can I get another?

[HeMan]

I was cleaning my Valken ASL Kilo the other day and notice I seem to be missing a clip.  As you can see in the picture, the mark shows there clearly was a clip there, like on the rivet above, but it is now nowhere to be seen!

 

The question is, what are they called (not a circlip, as its a full circle) and where would I be able to get one from?

 

It looks like something generic, that I might be able to buy from any hardware store, if only I knew what it is called!

 

Thanks.

 

[Asomodai]

They are called retainer clips. You'll need to measure the shaft that it connects to though to get the right size

 

[concretesnail]

You could try an e clip too. It's a three quarters of a ring with three tab tooth parts to bind with. I find they last a bit longer when they are removed and then replaced.

[HeMan]

Brilliant, once I had the right word to Google I found loads on eBay which will hopefully do the trick.  It seems they are also called startlock clips as well.