My HK MR223 jam like s**t

Sinasta said:
I had that issue with my SR15 with C77 ammo. It worked fine in the first mag, but it didnt lock back on empty. Then it turned into a bolt action. Never had any issues with AE ammo...but it hated C77 stuff.
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Same with mine. C77 ammo wasn't reliable. But it worked as expected with federal and Winchester/American eagle, and pmc.

Then I leant it to Slavex and found out it wouldn't run for him. Once I geT it back I'll see if I can replicate the issues he had with the ammo I have.

Until he had my gun, I was extremely happy with it. Now I'm a little pissed.

I also have an sr15 upper that's on my atr lower. It's been trouble free so far, with an unknown buffer spring and H buffer in a PWS receiver extension.

Having said that, if I had the money, I'd still buy another one.
 
In this thread: People who can't afford HK's feel vindicated by the fact that this guy's HK doesn't work.

This phenomena is also why you never tell anyone that your Benz/BMW/Audi/Porsche is in the shop.
 
design specs

its a 4500 dollar AR15 sold as a reliable combat weapon...?? how did i ignore that... also that buffer and stock i had problems with was given out for free with the first sales of KAC at Questar... I really dont think the reliability can be blamed on the user in such a case when the KAC are advertised the way they are.... e3 reliability ;) im not even gona get into the fact the finish came off on the Tan one i purchased before firing.

(sorry for the hijack) I would have thought the Mr223 would be more reliable on civi .223 ammo? Especially with the piston drive.
Anyone else think alot of the AR's problems are due to the small chamber space / ejection port rather than the drive systems?
just a thought.
 
I have a KAC SR-25 EMC and had a similar problem with lighter ammo (150gr) until it was broken in. After firing about 100x 180gr rounds through it it cycles reliably with athe lighter ammo as well. I also have an HK MR-308 which cycled reliably with all ammo types I put through it right from day one. A friend of mine has an HK MR-223 and has had no problems with it using the stock mag as well as LAR mags.

The problem sounds simillar to the problem I had with my KAC before it was worn in. I noticed the KAC has a much stronger buffer spring than the HKs. So may be try a heaver and/or hotter ammo type or a softer buffer spring. Otherwise you may have gotten a bit of a lemon. Can happen with any company.
 
agreed

ya could be a lemon.. as much as i push the com block i had a factory defect in the striker on my CZ... anything can happen, though break in wise my KAc was long past the break in.
 
wicked_police said:
Same with mine. C77 ammo wasn't reliable. But it worked as expected with federal and Winchester/American eagle, and pmc.

Then I leant it to Slavex and found out it wouldn't run for him. Once I geT it back I'll see if I can replicate the issues he had with the ammo I have.

Until he had my gun, I was extremely happy with it. Now I'm a little pissed.

I also have an sr15 upper that's on my atr lower. It's been trouble free so far, with an unknown buffer spring and H buffer in a PWS receiver extension.

Having said that, if I had the money, I'd still buy another one.
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Mines on a ATRS lower as well with RRA carbine spring and carbine buffer.
 
Thanks to all the advices. I still believe that it is the emag problem rather than the rifle and I will test it later again. I always think the HK is unjamable so it must be the mag. No gas setting.
 
proflui said:
Thanks to all the advices. I still believe that it is the emag problem rather than the rifle and I will test it later again. I always think the HK is unjamable so it must be the mag. No gas setting.
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Its the mag, if you have 5 Emags and 4 work fine then it is obviously the mag...

HK MR308 is fine from 147gr to 175gr...168 work best..

Depending on the rifle it takes at least 500 to 1500 rds to break her in properly...

If you run decent ammo in your AR, it will be fine....I doubt KAC rifle is the problem...more info needed..
 
angryeyebrows said:
Mine was an upper from One Shot and it had problems with any configuration I created. I shot all kinds of ammo through it, used ever buffer and spring combo I had, I even tried several different magazines. Nothing worked, so in the end, it went back to where it came from.
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Ouch. Lemons a lemon, I suppose.
 
My guess on the Hk was it was a mag problem.
Several units down here have had issues with some batches of EMAG's in their 416's
However main issue in Canada is the mag pinning, and that opens a batch of gremlins.

Always number your mags -- it allows tracking of reliability data.


On KAC SR-15's
Early guns where ported for M855, when it became scarce we opened up the ports to run PMC and other non M855 pressure ammo (C77 is not M855 and is a slower round despite the SS109 bullet type)
-- The SR-15 is a 2k gun, not a 4.5k gun, and we will fix issues people have if bought thru One Shot (our Canadian Distributor), as we have the export paper trail to bring them back here and send back. If its not thru One Shot the person needs to go thru the export/importer to get it back to us.
It was designed to run a Carbine buffer NOT an H buffer.
However if we fix a gun, or offer to fix a gun and you want to just return it to us, or to One Shot, there is a restocking fee, as its now a used gun.

Finish on the tan guns sucks -- it is GunKote like the Army SASS, which is not durable, but that was what the customer base wanted, Cleaning supplies eat GunKote -- now all guns we do in color are CeraKote which is a much more durable finish.
 
My SR15 upper( complete rifle from Questar) runs like a sewing machine with any ammo. I mated it to my old bushmaster lower with H-buffer (I forgot to switch the buffer one day and figured out it still worked, so never bother to swap buffer since then) and it works, unless the ammo is lame and under powered commerical stuff then it won't lock the BGC back at the last round. The SR15 is supposed to work with regular carbine buffer. I am happy with its relaibility so far.

However, the accuracy dept is interesting - sometimes it shoots super tight group, sometime it is just average at best. Mine has done some super astonishing groupings at 200m with run of the mill ball ammo, but it has also done some freaky flyers that did not make sense (could be ammo as well)

But those rail screws annoy me the most as they keep backing out- if the screws are not locktited and installed, the lower part of the URX will come out during shooting.
 
I'm actually shooting with an H2 buffer on my SR-15. No problems, even after 2k rounds with no cleaning. Almost all AE black box .223rem.
 
Quote:
Originally Posted by angryeyebrows View Post
Mine was an upper from One Shot and it had problems with any configuration I created. I shot all kinds of ammo through it, used ever buffer and spring combo I had, I even tried several different magazines. Nothing worked, so in the end, it went back to where it came from.
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Ouch. Lemons a lemon, I suppose.
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Actually we never had an issue with that exact upper at all. Put 300 rds down it with no problems when it was sent back to us. We tested it after Kevin confirmed it fired ok from the factory and wasn't a small gas port issue.

Ran out of ammo and the next time at the range used MFS and had failure to feeds and the bolt wouldn't hold open. Lubed it up and the failure to feeds stopped.

Took it to a course and a buddy wanted to buy it. Ran a bunch of ammo through it again without any issues. Bought it on the spot even after being told the history.

It was designed to run a Carbine buffer NOT an H buffer.
However if we fix a gun, or offer to fix a gun and you want to just return it to us, or to One Shot, there is a restocking fee, as its now a used gun.
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In this case we waved the restocking fee.

Why?

Cause that's the service I provide, and hope that this way, the client(s) will continue to buy from us.

unless the ammo is lame and under powered commerical stuff then it won't lock the BGC back at the last round.
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Bingo. MFS ammo does the same thing in my LMT upper.



Anyway, for the OP. Run different ammo and get her a little wet ;)
 
Farmboy said:
Actually we never had an issue with that exact upper at all.
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Well with the 200 rounds I fired down range, I did have problems...even when using the KAC recommended configuration. The performance was not what I expected and I could not in good conscience pass this on to the end user the rifle was intended for.

When I buy a high end complete upper receiver, I expect it to function...not just with expensive M855 ammo, but with anything I feed it. Maybe it is my fault that I missed the disclaimer that it will only work reliably with military 5.56mm ammo.

Bottom line, when it would not function correctly with ANY off the shelf ammo I had, it had to go. I am glad you found a home for it in any case.

Cause that's the service I provide, and hope that this way, the client(s) will continue to buy from us.
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I will continue to use One Shot Tactical for a source of equipment and parts, specifically because of the outcome of this transaction.
 
I'm glad it worked out in the end.

I have a SR15 upper on a Colt Lower (I have many lowers and I'm the odd one who does not like the ambo features) I run PMC and M855 for most shooting, as I use my 25 for accuracy matches, I purposely went looking for a small gas port barrel, as I wanted the least fouling and recoil I could get, here in Fl PMC runs on the small port -- in Canada in the winter or sometimes spring and fall it wont, and even some days in Jan here it wont lock back.

I want to appoligize to AngryEyebrows, as I did not get back to him in a timely manner, I need to get cloned, but I've had trips and visitors and my day job is gov stuff so I cant really deal with commercial issues when its busy on the gov side.
 
KevinB said:
I want to appoligize to AngryEyebrows, as I did not get back to him in a timely manner, I need to get cloned, but I've had trips and visitors and my day job is gov stuff so I cant really deal with commercial issues when its busy on the gov side.
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Don't worry about it. It all worked out and I understand you got a busy job. I'm just glad you still have time for us Canadians! :cheers:
 
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