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Polish feed ramp..

Keeping your firearms functioning properly and repairs

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RafMan
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Polish feed ramp..

Postby RafMan » Wed Jul 20, 2011 6:45 pm

So I picked up a new M22 rimfire pistol. The manufacturer's web sight says that to break it in I should put at least 200 rounds through it and then polish the feed ramp.

http://www.issc-austria.com/index.php?o ... 3&Itemid=3

:?: Is that really as easy as taking some 400 grit sandpaper to it like the youtube videos show? Or should I take it to a gunsmith? TIA

-Raf



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Postby nvisn » Wed Jul 20, 2011 7:01 pm

Do you know Shane?
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Postby RafMan » Wed Jul 20, 2011 7:25 pm

Yes indeed

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Postby nvisn » Wed Jul 20, 2011 7:26 pm

Small world, I saw your gun today.
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Postby PaiN » Wed Jul 20, 2011 8:27 pm

Please, tell us how your ISSC M22 runs once its "broken in". I've wanted one for a long time but have not been able to bring myself to buy one because of all the bad reliability issues I've read about with the M22.

As for the polishing the feed ramp...I like to use 1500grit sp or jewelers rouge and the polishing wheel on my roto-tool.
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Postby JohnFH » Wed Jul 20, 2011 9:54 pm

I prefer to polish a feed ramp by hand, held securely in a vise, 400 grit wet dry soaked with oil to start, always backed up by a hard block of appropriate radius, then 800 followed by a polishing compound on 1200.

I usually black or blue the ramp in the beginning to identify any high or low spots, and to make sure I'm not altering the geometry of the ramp.

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Postby RafMan » Wed Jul 20, 2011 10:05 pm

PaiN wrote:Please, tell us how your ISSC M22 runs once its "broken in". I've wanted one for a long time but have not been able to bring myself to buy one because of all the bad reliability issues I've read about with the M22.


Not sure this belongs in this forum, so admins please feel free to move.

I put 300 round through the M22 in 45 minutes. Fun to shoot. No recoil. And probably more accurate than a lousy shot like me can manage.

Of the 300 rounds (all CCI mini mag) I had:

- 3 fail to fire. All 3 rounds showed clean strikes, so I rotated them and put them back in the mag. All 3 fired on the second try.
- 1 fail to eject. The case came right out when I racked back the slide
- 1 stovepipe. Fed through fine on the 2nd try

I was only aiming for the first 50 rounds. First 20 rounds at 15 feet, next 20rounds at 20 feet and the last 10 at 25 feet. I'm not much of a shot, but at 15 and 20 feet everything was inside the 8 , 9 or 10 ring of a SR-21C target. At 25 feet 9 of 10 were inside the 8 ring and 1 in the 6 ring.

All in all I think it is worth the money. I read lots of reports about it being picky about ammo, but IMHO it ate up the CCI mini-mags fine.

The gun did heat up quite a bit, I guessing because of the aluminum.
Last edited by RafMan on Sat Jul 30, 2011 5:42 am, edited 1 time in total.

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Postby PaiN » Thu Jul 21, 2011 5:24 am

Were the failures that you had early in the 300 rounds? As in, "before break in".
I'm sitting on ~4k rounds of CCI Blazer 40g HV .22lr in my stock pile atm :D
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Postby SR9 » Thu Jul 21, 2011 6:52 am

JohnFH wrote:I prefer to polish a feed ramp by hand, held securely in a vise, 400 grit wet dry soaked with oil to start, always backed up by a hard block of appropriate radius, then 800 followed by a polishing compound on 1200.

I usually black or blue the ramp in the beginning to identify any high or low spots, and to make sure I'm not altering the geometry of the ramp.


+1 The way to go.

My dad was a machinist/tool/die maker for 30+ years and what John described was his preferred method. I worked at the same company as my dad as summer help and his work was outstanding. I miss him, learned a lot from him.
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Postby RafMan » Thu Jul 21, 2011 3:18 pm

PaiN wrote:Were the failures that you had early in the 300 rounds? As in, "before break in".
I'm sitting on ~4k rounds of CCI Blazer 40g HV .22lr in my stock pile atm :D

One fail to fire was in the first 20 rounds.
The fail to eject was somewhere around 50 rounds in.
The second fail to fire and the stove pipe were somewhere between rounds 101-200
The third fail to fire was somewhere around 201-220

The last eighty or so rounds went smooth except for the blisters on my thumb and finger from loading the 1 supplied mag over and over. :wink:

One thing I forgot to mention in my question is that the barrel (and recoil spring) are captive on the frame. According to the manual breaking the gun down further than removing the slide will void the warranty :? So it will be a tight space to work in.


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