MG4 Help

ROCHCH · Post by **ROCHCH** » Mon Mar 29, 2010 9:30 pm

This is my first post so bear with me. I picked up my new MG4 last week. Shot 50 rounds through it. I seemed to function well but I did notice that I had to really rack the slide back firmly. Brought it home and removed and cleaned barrel. Went back to the range yesterday and shot about 100 rounds, factory and reloads. On one of the last series I pulled the trigger and it went bang bang. I have never had a gun double before. Shot the three remaining rounds in the magazine and two more magazines without a problem. Thought I better call the US distributor. Got home and racked the slide back and the hammer would not stay back, trigger would not stay cocked. Removed the grip and after reading the owners manual again I think I have diagnosed the problem. For you MG4 owners these parts numbers are from the owners manual The slide,#4009, pushes the secondary release lever,#4059, backward which then engages the release lever, #4044. My slide is not pushing #4059 back far enough to engage #4044. Ocassionally #4059 will just barely engage #4044 but not the normal amount I get when I manually reset the trigger. I will call the US distributor tomorrow but I thought I'd check here first.

deadeyedick · Post by **deadeyedick** » Mon Mar 29, 2010 11:27 pm

Tycho, a regular contributor on this forum will be your man.

TB · Post by TB » Tue Mar 30, 2010 4:01 am

If it is anything like the mg2 you just have to adjust the sear engagement screw a bit anti clockwise. On the mg2 the sear engagement screw is located a little below the screw for grip rake adjustment, behind the grip.

Tycho · Post by **Tycho** » Tue Mar 30, 2010 2:50 pm

The MG4 trigger is completely different. Sear adjustment is done from the front, right behind the trigger. You can actually see the overtravel / sear engagement in a window in the frame. If the pistol reloads, the slide goes back far enough, so obviously no problem there. The slide actually does not have to touch the frame in the back to cock the hammer. Make sure that all four screws that hold the slide cover to the frame are tight - they get loose, the hammer doesn't stay up. The MG4 needs slightly more sear engagement than the old MG2. Apparently, newest series MG2 have the same trigger as the MG4. Good thing is, the MG4 trigger can be "locked" with the screw from the left side of the frame. Do not force the weight/overtravel adjustment without loosening this one first.

ROCHCH · Post by **ROCHCH** » Tue Mar 30, 2010 9:16 pm

Tycho,
Thanks for the reply. Your suggestions didn't take care of the problem but they did lead me to the answer. I realized the only thing different about the pistol between the first and second time I shot it was that I had removed the barrel. You mentioned that the slide cover srews needed to be nice and tight. When I removed the barrel, which I did several times trying to figure out the problem, I did not have the slide racked back. When I replaced the barrel it looked like it was on snug but it wasn't. There is quite a bit of forward pressure on the barrel when the slide isn't racked back. When I re-attached the barrel properly, problem solved. I'm also sure this is why I had some light hits on some primers. The silver lining in all of this is that I really understand the pistol better and have the trigger adjusted to my liking.

Brian James · Post by **Brian James** » Thu Apr 08, 2010 1:55 pm

Somewhat off topic, but does anyone know what the twist rate is of the stock barrel?

I'm asking for a very obvious reason, if it was a fast twist barrel and can produce a good group it would be an ideal pistol for NRA style shooting. If there is buy in from NRA shooters it would likey help ensure the longevitiy of the MG4, which helps us ISSF shooters.

Brian

PS if anyone can test it at 50 yards or 50m I would be very curious to know what the results.

Brian James · Post by **Brian James** » Thu Apr 08, 2010 1:56 pm

Somewhat off topic, but does anyone know what the twist rate is of the stock barrel?

I'm asking for a very obvious reason, if it was a fast twist barrel and can produce a good group it would be an ideal pistol for NRA style shooting. If there is buy in from NRA shooters it would likey help ensure the longevitiy of the MG4, which helps us ISSF shooters.

Brian

PS if anyone can test it at 50 yards or 50m I would be very curious to know what the results.

Brian James · Post by **Brian James** » Thu Apr 08, 2010 1:56 pm

Somewhat off topic, but does anyone know what the twist rate is of the stock barrel?

I'm asking for a very obvious reason, if it was a fast twist barrel and can produce a good group it would be an ideal pistol for NRA style shooting. If there is buy in from NRA shooters it would likey help ensure the longevitiy of the MG4, which helps us ISSF shooters.

Brian

PS if anyone can test it at 50 yards or 50m I would be very curious to know what the results.

Tycho · Post by **Tycho** » Thu Apr 08, 2010 2:13 pm

Not that I need 50m capability, but that could be interesting indeed. So far, the MG4 seems to be an exceptionally accurate pistol, with practically everything we've put through it. I'd be very interested in a objective 50m test, if only for academic reasons.

Brian James · Post by **Brian James** » Thu Apr 08, 2010 2:22 pm

Tyco,

If you are willing to try it out to 50yards/m even if its academic it would be greatly appreciated if you could share your experience with us.

Thanks,

Brian

TomAmlie · Post by **TomAmlie** » Mon Jun 14, 2010 9:39 am

Has anyone yet tried out the MG4 at 50 yards/metres?

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MG4 Help

MG4 Help

MG4 Help

50 yard/metre performance?