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Old 10-12-2017, 04:45 PM   #1
crotalus
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Default DDI74 fixed, what I found out...

A while back I was having a really hard time getting any help from PSA/DDI for warranty work on my rifle. I didn't have 1k rounds out of it and the barrel started coming apart. I decided to go with someone local to work/repair it since I am not sure what tomorrow can bring in regards to my health. Lee Armory isn't too far from the VA hospital/airport so stopping in there wasn't big deal.




Ended up though running into problems with the trunnion. The American made barrels would not fit it, including the oversized barrel. Lee Armory tried to order a custom/one-off barrel but couldn't find anyone who could build one. The oversized barrel could slide easily in and out of the trunnion and the DDI original would not. To me it looked like someone reamed the trunnion wider and took all the marks off. The other problem was that the rivets were not counter-sunk/done poorly. I was told that this was a sign of sloppy work.




Before:




After:




Lee Armory went out of their way to help me with finding parts to repair the rifle, fixing all the little problems, etc. I got calls, pictures, whenever anything came up and they always kept me in the loop with what was wrong with the rifle. The guys at Lee hooked me up with a Bulgarian barrel and a new trunnion at a very, very low cost. While it was very frustrating to find out these problems I'm glad I have a solid rifle now. I don't know if this is why PSA never called or helped. And I don't know if DDI was doing this with all their rifles but I don't think it would be worth the risk buying a [used] DDI if the problems are unknown. I can say Lee hooked me up though.

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Old 10-12-2017, 07:10 PM   #2
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Glad it worked out well for you! Seems like people either love or hate Lee Armory. I've never had an dealing with them, but glad they got your rifle back the way it should be.
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Old 10-12-2017, 07:21 PM   #3
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That settles it for me. DDI is junk
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Old 10-12-2017, 07:49 PM   #4
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So why was the breach face messed up ??

I still don't see a answer to the original problem??

I'm wondering if your original trunion was phosfated to long causing the oversized condition at one point?

I seriously doubt DDI made a one off barrel for your mileage spec trunion that's oversize.
I'm not saying it's not oversize but why?

Again what caused the odd wear on the breach face ??
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Old 10-12-2017, 07:50 PM   #5
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BTW glad you got good help at a good price and got this fixed.
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Old 10-12-2017, 08:39 PM   #6
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Quote:
Originally Posted by 1biggun View Post
So why was the breach face messed up ??

I still don't see a answer to the original problem??

I'm wondering if your original trunion was phosfated to long causing the oversized condition at one point?

I seriously doubt DDI made a one off barrel for your mileage spec trunion that's oversize.
I'm not saying it's not oversize but why?

Again what caused the odd wear on the breach face ??
It could be who ever made them, was able to make them to the spec of the trunnion. Anyone that Lee Armory contacted couldn't do it. I think it's a barrel that is soft vs the harder bolt. I have a picture of a barrel with similar damage that was put on a FB Radom forum but it's all in Polish.

Mel64D agreed to do the hardness testing and to measure the trunnion. Hopefully he can find something out that can explain what happened.
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Old 10-12-2017, 08:44 PM   #7
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Quote:
Originally Posted by DOS AK's View Post
Glad it worked out well for you! Seems like people either love or the Lee Armory. I've never had an dealing with them, but glad they got your rifle back the way it should be.
Thanks. This was my first time dealing with them. From what I saw everything was dress right dress, in order etc. I was told they were using rivets that Definitive Arms made (I think they're close to Russian). I don't know if that is a big deal or not but thought it was cool. Can't say they have bad customer service and the Bulgarian barrel was icing on the cake.

The only big mistake they made was not engraving "Don't Do It" into the side LOL
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Old 10-12-2017, 09:19 PM   #8
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If the barrel was nitrided it should be pretty damn hard on the surface.

I recall studying the bolt and it's contact a lot when you posted those pics.

I can't think of any reason to enlarge the trunion bore on purpose and to the make a bigger barrel for them except to maybe make all the trunions uniform so a single barrel dimension fits.
Nobody does that.

I have hears of people leaving parts in the phosfate bath to long and have parts not fit after. Was a thread on Gunco years ago about it.

Any one with a proper blank and reamer can make a barrel.
Your trunion us still usable.
If it were mine I'd have used it in a 223 build for example .

Will be interesting to see what Mel finds.
I'd be looking close at case protrusion as well .

Again glad you got good service and we're able to promote Lee Armory. Sounds like they deserve it.
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Old 10-12-2017, 10:05 PM   #9
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http://i.imgur.com/shmOVm6.jpg

http://forum-bron.pl/viewtopic.php?t=158934

check this out 1biggun, i can't read Polish but that's where i found that image
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Old 10-12-2017, 10:39 PM   #10
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Was this a waffen DDI? Or a DDI marked receiver kit build?
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Old 10-13-2017, 06:50 AM   #11
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DDI 74, when David Fillers was talking about them on here he said he got all the kits from classic. Something about nothing wrong with them and they were built to same standards and quality as their 47's.
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Old 10-13-2017, 08:47 AM   #12
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Crotalus in the first post where you said barrel started coming apart, do you mean loose in the front trunnion or ?

I've only got about 500 through my DDI AK74, and want to know what to watch for. No problems yet.
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Old 10-13-2017, 09:04 AM   #13
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hey Medcpt,

The front trunnion and the barrel weren't loose they were tight. The barrel was losing parts of the metal as though it was chipping parts off or knock pieces off. What I don't know is how minor or serious it would be to have rivets that were not countersunk. I'm new to AK's compared to everything else so I'm still learning at this point.
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Old 10-13-2017, 05:05 PM   #14
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Quote:
Originally Posted by crotalus View Post
Thanks. This was my first time dealing with them. From what I saw everything was dress right dress, in order etc. I was told they were using rivets that Definitive Arms made (I think they're close to Russian). I don't know if that is a big deal or not but thought it was cool. Can't say they have bad customer service and the Bulgarian barrel was icing on the cake.

The only big mistake they made was not engraving "Don't Do It" into the side LOL
Close =). It was a partnership on the DLA-AK Rivets. Team work ! =).

Thanks guys for all of the feedback. Have a great weekend!
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Old 10-14-2017, 02:24 AM   #15
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Quote:
Originally Posted by crotalus View Post
...
What I don't know is how minor or serious it would be to have rivets that were not countersunk.

...
I will say this:

I tried a few AK74s made with Bulgarian parts kits on US made receivers where the rivets were not properly countersunk (cough, JRA .. cough, DDI), and the rivets walked out on me after 1,500 rounds or so, to the point where the dust cover popped off while live firing, or the bolt carrier clearance caused various FTFs and FTEs due to the carrier wobbling in the rails worse than my 91 year old mother in law's aged titanium knees.

Whew!

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