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  #1  
Old 08-02-2018, 10:44 AM
Wishoot

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Help! Strange failure / malfunction



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Had some very strange strange failures/malfunctions with my new MKIV Target yesterday. Here's the basics:

Blazer 40g
Only happens on last round



I don't have a ton of experience with rimfire pistols (plenty of experience with centerfire however), and I've never seen anything like this before. Was shooting CCI SV, and Aguila SE last week and didn't have this problem.

What could be the cause of this strange issue?

Last edited by Wishoot; 08-02-2018 at 10:52 AM.
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  #2  
Old 08-02-2018, 10:51 AM
rc.

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Check the tip of the feed ramp and the magazine. Maybe the lips are stretched out and your round is flipping up. Do you have a different mag?
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  #3  
Old 08-02-2018, 10:53 AM
Wishoot

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Quote:
Originally Posted by rc. View Post
Check the tip of the feed ramp and the magazine. Maybe the lips are stretched out and your round is flipping up. Do you have a different mag?
I'll check, but these were all brand new factory mags.
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  #4  
Old 08-02-2018, 03:17 PM
Test_Engineer

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Feeding problems fall into 2 categories:

1) Random round number
2) Always one of the last 2 rounds

The first category is caused 90% by how the mag is positioned and 10% by how the rear feed lips are tuned.

The second category is 100% caused by a marginal follower design.


Quote:
Originally Posted by Wishoot View Post
Had some very strange strange failures/malfunctions with my new MKIV Target yesterday. Here's the basics:

Blazer 40g
Only happens on last round
Your problem is caused by the follower. You can find the fix here in post #6:

https://www.rimfirecentral.com/forum...d.php?t=604880

When you're removing material, take care not to remove any from mid V-notch on back. Doing so can result in rounds that can fall out of the mag.

Thanks for reminding me. I have a couple new mags that I still need to do this to.
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  #5  
Old 08-03-2018, 10:16 AM
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Theo98
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Quote:
Originally Posted by Test_Engineer View Post
Feeding problems fall into 2 categories:

1) Random round number
2) Always one of the last 2 rounds

The first category is caused 90% by how the mag is positioned and 10% by how the rear feed lips are tuned.

The second category is 100% caused by a marginal follower design.

Your problem is caused by the follower. You can find the fix here in post #6:

https://www.rimfirecentral.com/forum...d.php?t=604880

When you're removing material, take care not to remove any from mid V-notch on back. Doing so can result in rounds that can fall out of the mag.

Thanks for reminding me. I have a couple new mags that I still need to do this to.
Great Info, TE...Thanks for sharing (now bookmarked for future reference)!!

Ted
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  #6  
Old 09-28-2018, 02:02 PM
Wishoot

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Quote:
Originally Posted by Theo98 View Post
Great Info, TE...Thanks for sharing (now bookmarked for future reference)!!

Ted
Quote:
Originally Posted by Test_Engineer View Post
Feeding problems fall into 2 categories:

1) Random round number
2) Always one of the last 2 rounds

The first category is caused 90% by how the mag is positioned and 10% by how the rear feed lips are tuned.

The second category is 100% caused by a marginal follower design.




Your problem is caused by the follower. You can find the fix here in post #6:

https://www.rimfirecentral.com/forum...d.php?t=604880

When you're removing material, take care not to remove any from mid V-notch on back. Doing so can result in rounds that can fall out of the mag.

Thanks for reminding me. I have a couple new mags that I still need to do this to.
Thank you for help.

It's still very strange. So far, it's only happened with CCI Blazers.

Aguilla (standard and HV), CCI (Mini-Mags, Standard) all seem to function just fine.
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  #7  
Old 09-28-2018, 02:39 PM
Test_Engineer

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I hope the follower mod got you fixed up. It works well on "tip-up" and "overrun" jams. There is another problem I've seen feeding the last round. The bullet can get bent down in the shell a little leading to light strikes and fliers. I don't think it's related to your problem, but here's a post I made a while back on dealing with that problem as well.

https://www.rimfirecentral.com/forum...3&postcount=10

Perhaps worth considering anyway?
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  #8  
Old 09-28-2018, 08:18 PM
Flash_80

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Quote:
Originally Posted by Test_Engineer View Post
Feeding problems fall into 2 categories:

1) Random round number
2) Always one of the last 2 rounds

The first category is caused 90% by how the mag is positioned and 10% by how the rear feed lips are tuned.

The second category is 100% caused by a marginal follower design.




Your problem is caused by the follower. You can find the fix here in post #6:

https://www.rimfirecentral.com/forum...d.php?t=604880

When you're removing material, take care not to remove any from mid V-notch on back. Doing so can result in rounds that can fall out of the mag.

Thanks for reminding me. I have a couple new mags that I still need to do this to.

WHAT HE SAID.

I had this issue last year on my MKIV. Mine jammed the 9th round and scraped the head off the 10th. Followed the instructions to level out the followers on all of my mags and it was gone. I was having that on Browning or Golden Turds or anything that didn't have a totally slick bullet profile like a mini-mag. Gun feeds a full mag of anything after working over the followers.

Score the line on the follower while still in the mag with a razor blade. Take it apart and sand down evenly to the line with a dremel or whatever. Smooth it all back out with sandpaper, and put it back together.

Last edited by Flash_80; 09-28-2018 at 08:20 PM.
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