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I’ve got a M3 22/45 that I can not for the life of me get the mainspring housing to come out. I can release the latch but can not get the housing to pivot so I can pull it out. Any tips or ticks. I’m to the point I’m worried I’ll damage the grip by trying to pry it out. Thanks for the advice.
 

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Did you pull the trigger and let the hammer fall before you pulled the latch out?

If not, do it. If you did then sometimes a tap or push rearward on the barrel will seat the lugs better and give it some slack. Firing or dry firing on some pistols will push the barrel slightly forward on the lugs.
 

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This is an outstanding Video on how to take down, and reassemble your MKIII.

You may have to hit pause a few times and rewind it, but every thing you need to do is in this video.
Now you must do every step including the trigger pulls, and the correct orientation of the pistol. No step can be modified.

Smooth
 

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Don’t pry on it. It won’t help. If it was put together incorrectly, unfortunately you have to drive the hammer pin out to get it apart. Then put the parts back in after taking it apart.

Did you have a mag in it when you dry fired it to take it apart?
 

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I have a MKII678G (I've had it for years, so yes, I do know how it works) with what sounds like the same issue. With the hammer in the fired position, the lever pulls easy-peasy. The housing is a different story. I used to think I could fix it, thought better of monkeying with it and use an alternative method. I have a bunch of leather scraps laying around, so I wrap the lever, cover the base and gently pry the housing using pliers and the base as a pivot point. If I am feeling particularly manly, I can do it without the pliers (still need the leather to get a better grip), but they make it sooo much easier.
Just looked, been doing it this way for 14 years. Maybe one of these days it will wear in.
 
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