ISSC MK22 - Ejection port won't stay open

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Luffy

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Hi,

I recently purchased an ISSC MK22, it was used with no manual and I haven't been able to find one online.

Looking at the GSG 15 manual (which should be identical in function), I should be able to lock the ejection port open by inserting an empty mag and operating the charging handle. I've done this numerous times and it won't stay locked open. The magazine safety slide / spring in the mag well is freely moving back and forth when I move it manually.

As my first firearm, I'm concerned for 2 reasons, I would consider it good safety practice to leave it empty with a visibly open action at the range, and I would like to know its functioning 100%.

Any guidance on what could be causing the issue? Its a 2nd Gen MK22 if it makes any difference.

Regards,
Adam
 
I have the same gun yes it is supposed to stay open. Mine did when I first got it. I,m finding now it is not locking open on the last round . I did find if I pushed up on the mag sometimes it would stay open. I just have not had time to look at it yet
 
I'd start by taking apart the magazine and giving it a good cleaning, need a t8 and t10 torx if i remember correctly, double check the sizes I could be wrong.
 
Hi, I just tried pushing up on the magazine and it allowed it to lock open, thanks! If you determine what would cause this to happen, please let me know.
 
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