Five-seveN mark II cycling issue

[SpecialCircumstances]

Hi,
Just bought a 5-7 a couple of months ago. I've wanted one for years and I finally got over the price tag, and thus far I can say with 100% honesty that it's by far the best handgun experience I have had, overall. The only issue I have had, and it's a relatively minor one, is that it tends to pull the shell out of the casing if I cycle the action to remove the chambered round. This happens maybe one in five times. Usually this isn't an issue because I don't like to chamber a round unless I plan on shooting it but, on two occasions now (someone trying to get into my garden shed, and someone shooting right in front of my house in the middle of the night) I had a round chambered that came apart when I cycled the action to remove it. Both times getting gunpowder all over the magazine well and action, not to mention my bare feet. Like I said, no other problems with it, never experienced a failure to feed or a jam or anything. So, was wondering whether this is a common issue? If so, is it something that gets better after use (I have put less than a thousand through mine, all said and done)?

thanks in advance,
a

[panzermk2]

This is most likely casued by 2 things.

1) Primarily America Eagle ammo which is shit and has issues with bullets falling out and into their cases.

2)Also Lacquer build up in the chamber contributing.

[mikepwagner]

This is most likely casued by 2 things.

1) Primarily America Eagle ammo which is shit and has issues with bullets falling out and into their cases.

2)Also Lacquer build up in the chamber contributing.

How do you prevent lacquer buildup in the chamber? Will normal gun cleaning - ie, Hope’s No. 9 remove the lacquer?

[Rapier1772]

How do you prevent lacquer buildup in the chamber? Will normal gun cleaning - ie, Hope’s No. 9 remove the lacquer?

Hoppe's 9 doesn't work on lacquer & you can't prevent it since it's on the shell casings. Use carb cleaner but do not get any of it on the polymer!
Pull the barrel out like you usually do when cleaning but wrap your chamber brush in rags soaked in carburetor cleaner & clean it that way. Then go back to cleaning as usual
& get all the carb cleaner off.

[panzermk2]

Elite Ammunition Five Seven Chamber Cleaning
https://youtu.be/HPXXzrnaEek

Elite Ammunition Five Seven Firing Pin Channel Cleaning
https://youtu.be/5Di5Ohuq0aI