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4/24/2006 7:08:20 PM EDT
How much is acceptable?  I homebuilt my receiver, and the ejector is starting to mushroom.  I need to measure it to see how much it's changing, but it's visually mushroomed a little bit.  

I'm going to assume that this is NOT normal wear, and my next question is, how can I correct it?  I think I read somewhere someone case hardened their receiver holes/rails?  I need something that won't require disassembly.  Heating it with a pencil torch will probably work ok though,

oy.  
4/24/2006 7:15:25 PM EDT
[#1]
Yes, harden it with a torch, and if it doesn't work, you can always TIG a bead back on there. The weld doesn't need any additional hardening.
4/24/2006 7:24:30 PM EDT
[#2]
As I recall though, there was some kind of paste or powder you apply, then heat the part and you're done.  Does that sound familiar?  Obviously my first method of red(?) heat then quenching in water didn't work.  Turned it a pretty color though.  
4/25/2006 3:51:13 AM EDT
[#3]
How many rounds have you fired? Does it still eject the empties?
4/25/2006 7:26:30 AM EDT
[#4]
Maybe 100.  It hasn't interfered with operation yet, but.....
4/25/2006 8:01:51 AM EDT
[#5]
kasenit case hardening compound is what ur talking about. get it at brownells.

you didnt harden it right. first you need to harden it by heating it to around 1500 F and then quencing it. it will be very hard, but very brittle now.  to make it not so brittle you heat it again to around 800 F and then let it aircool.

gunsgutsandgod.com/SBS%20tutorial.htm for more info.

edit:

www.surplusrifle.com/shooting2005/souptonuts2/index.asp also has some good heattreating info.
4/25/2006 8:34:41 AM EDT
[#6]
Thanks.  I'll have to check ebay, brownells is out of stock.  But that procedure is exactly what I did...  My best guess is that I didn't heat it up enough, although it got to orange heat?  

Is it true that there should be no deformation at all, ever?


edit - It appears as though you still have to quench with kasenit.  That's what I was hoping to avoid.  How do I do that without tossing the rifle in the bathtub?  hinking.gif
4/25/2006 9:04:57 AM EDT
[#7]
I have had to re-harden ejectors on complete rifles in the past.  I removed all the parts that I could, (fcg, furniture, etc), then did my initial heat, quenched the whole receiver, cleaned up the ejector then did my tempering heat.  When the rifle was completely cool I hit the whole rifle with WD-40 and cleaned and oiled as usual.
4/25/2006 9:13:47 AM EDT
[#8]
www.mcmaster.com/

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3204K1
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