UC-9 from century

[gradyhall]

I got a uc-9 from Classic arms lat week and it had off bad off center primer strikes and the bolt eat up the brass. I tryed to get them to fix but they said that it was sold to classic over a year ago so no warranty. But the gun shot great even with the bad paimer strikes. So I fixed the gun my self see the pic

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[chipster]

How did you fix this? I know a Vector with the same issue, but haven't been able to figure out the culprit yet and Vector doesn't have any interest in resolving.

 

[MPA guy]

If I was told they wouldn't honor their warranty, I would have been asking for a supervisor. And if that didn't work, I'd be contacting:

Our Corporate telephone number is: (561) 265-4500
Our Corporate fax number is: (561) 265-4510
Email: Corp@centuryarms.com

 

[panhead5]

Are any of the parts interchangeable with IMI ?

 

[MPA guy]

Has IMI ever made a semi auto version of their (full size) uzi? Especially a closed bolt version of it?

Or are you asking about Group Industries or Vector or ?

 

[gradyhall]

Don't know about the imi I have never saw one. No parts needed to fix the primer problem.

 

[panhead5]

IMI has a fullsized SA . Was wondering if the parts were interchangeable with any of those.

 

[SPARKY42180]

I had the exact same issue with one that I bought from PSA a few months ago. Off center primer strikes, eating the rim of the brass, and mine was also having FTF and FTE's. Contacted Century and got the same story. Left their factory about 14 months ago so out of warranty. However, I was asked to send a copy of my receipt, or form from my FFL and they would take care of it. I got my RMA# the same day I sent the info they requested (today).

 

[Cleveland Sport and Survival]

Century sure knows how to pass some crappy builds off. Can't tell you how may AK's I've seen that looked like a 3 year old assembled it.

 

[Makarov]

Gradyhall,

So HOW did you fix the issue? I also have a Century UC9 that ejects spent cases EXACTLY like what is shown in the top case in your pic. I would really appreciate any guidance as I am stumpified.

Thank you in advance!

 

[Makarov]

As I examine what is happening to my UC9, it seems like as the bolt assembly moves forward and the striker bar engages the sear, that somehow this action is placing upward force on the entire bolt, pushing it up and causing the round to sit off-center relative to the bolt face.

When I perform the gap test, the gap is within spec (.005"-.015") when the striker is uncocked (in the fired position) but is super tight (<.002") when the striker is cocked (in the ready to fire position).

Anybody have any ideas?

 

[MPA guy]

I speak for myself only.

I have fired between 500 and 600 rounds through my Century uzi since getting it about a two weeks ago.

I have noticed that the face of the bolt appears to be ever so slightly off center in relation to the barrel chamber if you look at the bolt face where the bullet will seat and where the firing pin comes through.

My firing pin does strike more to one side than center, but mine is not wrinkling the primers when it goes off or strikes it as appears in the original post, however the firing pin does go rather deep into the primer. Even the hard Russian import primers.

I can try to take some pictures later, but this is a non-issue for me.

The semi auto's use a firing pin, whereas the full auto bolts, obviously are machined into the bolt face itself, so it would be very difficult at best to have everything lined up as perfectly as it would be if it were machined that way Especially taking into consideration that the firing pin hole will have to be slightly larger diameter than the firing pin itself and there will be "some" movement as the firing pin travels forward.

As for eating one side of the rim as Sparky mentioned, mine has not been doing that, however, there is an ever so slight indention on the opposite side of the brass as the firing pin is hitting, but it is barely visible and I don't think it is going to be an issue reloading or function wise.

In these pictures, the firing pin strike would be in about the 5 o clock position and the rim indention are all in about the 9 o' clock position.

Being all the same placement relative to another, to me, that would indicate it is more a mechanical alignment.

If it is more than you are comfortable with, it would likely be possible to buy a McKay bolt and firing pin and try it to see how that does.

But would be a $200 something dollar gamble.

But for me, mine has ran flawlessly, despite the off center primer strike, so I'm not messing with it.

If it ain't broke....

 

[Fatboy148]

.

If it is more than you are comfortable with, it would likely be possible to buy a McKay bolt and firing pin and try it to see how that does.

But would be a $200 something dollar gamble.

I would ask here (at UziTalk) if there is anyone within driving distance of your zip code to try their bolt, carrier, and cover, before I dropped the $$$ to try a new set up or just move up the food chain at Century as was described above.

 

[chipster]

MPA - I might stock up on a couple of extra firing pins, that deep you may be hitting the inside of the primer pocket. I'm surprised you aren't piercing primers.

Is your bolt running smoothly on the inside of the receiver without anything else in there or is it perhaps riding up and over either the mag or the ejector? perhaps if riding over the mag/ejector that is causing the bolt to ride a little high.

 

[MPA guy]

Chipster, to be perfectly honest, I cannot tell for certain if the bolt is dragging over the mag. It doesn't feel any different pulling the bolt back by hand with and without the mag inserted.

I can however see the bolt rubbing the top of the follower on an empty mag as I slowly close it by hand, as you can see the oily track in this picture.

I cannot see any wear on magazine feed lips and the bolt is clearing the ejector. I can see it clearly looking through the ejection port.

Nothing is in the receiver to cause the firing pin to drag except some welds that are so far back that I don't think is contacting it at all and the trigger sear itself.

Here are the photo's of the bolt face to show how the casing is not 100% centered in relation to the firing pin hole.

I took several pics to get the best angles that I could and this was the best that I could get.

 

[Makarov]

MPA - *snip*

Is your bolt running smoothly on the inside of the receiver without anything else in there or is it perhaps riding up and over either the mag or the ejector? perhaps if riding over the mag/ejector that is causing the bolt to ride a little high.

The bolt runs smoothly. I inserted a mag without the sping or follower and the it offers no resistane to the bolt. The bolt seems to pass effortlessly over the Ejector without hangup. I used a little paint to see if the bolt was riding up the restrictor ring but the paint mark indicates that just the barrel is making contact with the bolt along the upper left quarter. The barrel and trunion and receiver all seem to be in correct alignment.

The only thing that is strange is that when the bolt closes and the striker assembly is captured by the sear, the gap between the bolt and the top cover disappears to less than .002. When the trigger is pulled (even on an empty chamber) the bolt gap opens back to the normal gap range (.005-.015 with an average of .010). It seems like the sear is somehow lifting up on the striker "leg" (for lack of a better term) causing the bolt to rise slightly. This is what I am thinking allows the cartridge to slip slightly below the bolt face with the resulting off-center primer strikes. Of course this is all just me guessing. I am no UZI-smith but I stayed at a Holiday Inn Express.

Thank you to everyone who has offered input/opinion. I really appreciate the help!

 

[MPA guy]

You mentioned the trigger sear lifting up on the leg, I noticed that when my top cover is off and I can look down inside the receiver and dry fire it, that mine has some negative travel (pushes it rearward a little) before it goes forward, but mine does not raise up.