HI CAPA slide not locking back manually

[Wegalaxy]

Hello,

This is my vorsk hi capa.

Very old and very used. 

When firing the pistol it locks back no problem after the last shot.

If I insert the magazine without bbs and manually pull the side back, the pistol slide doesn't lock back. 

THIS ISSUE ONLY HAPPENS WITH ONE OF MY MAGAZINES.

(In the video)

The internals look fine, the follower has a mark on it but I don't see how that's an issue.

Any help or guidance to parts or fixing the problem would be appreciated.

Thanks

Edited August 15 by Wegalaxy

[theSwede]

Could be that the magazine spring has started to loose some tension. 

[Nick G]

10 hours ago, theSwede said:

Could be that the magazine spring has started to loose some tension. 

This is the likely culprit. You could take the spring out and stretch it a tad. The kick of the slide moving back when fired is probably enough to jolt the follower up to lock it back.

[Wegalaxy]

Hey guys, This has fixed the problem. Thanks for the help.  

[mirinjawbro]

i also have this on a 1911 except the gun is almost new. all 3 mags do it. any idea?

[Nick G]

1911's seem bad for this. It's usually the follower spring not having the strength to push the take down lever up . I've found on one or two where I've removed the detent pin that preses against the take down lever that sorts it.

However the little spring that pushes on the detent also pushes the safety lever detent so a bit of fettling is sometimes required.

[theSwede]

Could also be that you’re using gas thats too strong so the slide travels back and forth too fast to lock back.