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View Full Version : 5.56 American Eagle XM193J Problem - Anyone Else?


dandingo13
04-22-2012, 4:05 PM
So my BIL just finished building his Del-Ton midlength AR with DMPS lower and took it to the range yesterday. He started out with AE 5.56 XM193J 55 grain in the black and white box and said that the firing pin was striking the primers perfectly but the rounds were not going off. He said that out of 150 rounds, this happened in more than FORTY rounds of the AE.

He then switched over to PMC .223 and said that the rifle was running fine. Not a single hiccup. The AE is from Palmetto State Armory. Here it is ...

http://i45.photobucket.com/albums/f89/ukuleledan/c6cf68e6.jpg

I'm hoping it's the ammo and not the rifle. FYI, the lower does say both .223 and 5.56. Thanks in advance.

Update in post #34.

FourLoko
04-22-2012, 4:31 PM
haven't heard any such things elsewhere

jingerale
04-22-2012, 4:31 PM
I use this ammo, have never had an issue.

h0use
04-22-2012, 4:37 PM
i have also used that ammo with out any problems... is the firing pin hitting them all the way?light primer strike? post some pics of the rounds.

ExtremeX
04-22-2012, 4:37 PM
I use XM193 as well... Never had an issue with it. Does not seem like a common issue...

What type of FCG are you using? A standard mil spec kit, or has the hammer spring been changed?

Only thing I can think of is light primer strikes, some bad parts in the AR (firing pin, hammer spring, something else), or maybe even a bad batch of ammo, highly unlikely but possible?!

Buy some more XM193 from a different source/store/batch# and try it again.

Testing is the best way to find out what the problem is.

Without additional information its hard to trouble shoot the problem, but my money is on the rifle.

EdinKali
04-22-2012, 4:38 PM
Never had an issue either. Fairly accurate too. Shot a 0.7" group(5 shots at 100 yds) with my 16" bull barrel after a quick dial in for this ammo.

JavaBrewer
04-22-2012, 4:41 PM
I bought a bunch of AE XM193 a month ago and my Mini-14 absolutely loves it. Shot 300 rounds so far and not a single issue. Try shooting it with another rifle?

BigFatPanda
04-22-2012, 4:45 PM
Friend of mine had the exact same issue with a brand new build. Turns out the hammer spring was in backwards causing light primer strikes.

ZombieTactics
04-22-2012, 4:53 PM
No probs with XM193 ever.

knkali
04-22-2012, 5:13 PM
just ran 100 rnds of this today without probs

dandingo13
04-22-2012, 5:30 PM
Hmm, that's good info. I'll take a look at it tonight and see if that's the case. Thanks for the info.

Friend of mine had the exact same issue with a brand new build. Turns out the hammer spring was in backwards causing light primer strikes.

I also appreciate all of the other info. I've also shot plenty of XM193 with no problems but just wanted to make sure it wasn't the ammo. I was thinking light primer strike as well. Unfortunately, he didn't bring any of the ammo home. I'll let you know what I find out.

InkHammer
04-22-2012, 5:30 PM
Have some of the same stuff from PSA... Only shot a few boxes but no problems. What is the lot # if you don't mind?

Dhena81
04-22-2012, 5:39 PM
My bet is the hammer spring from a cheap LPK. BTW its the stamp on the barrel that determines the cartridge to use not the lower receiver.

WETP
04-22-2012, 6:12 PM
3 Tactical classes in the last two months, which is about 2500 rds without malfunctions.

ericneth63
04-22-2012, 6:23 PM
500 rds in a carbine class and not one issue. Good stuff, in fact trying to find some.

Press Check
04-22-2012, 6:38 PM
No problems on this end with XM193. I think it's great ammo.

wizdumb
04-22-2012, 6:39 PM
dandingo13: Does the stamp on the barrel say that it's chambered for .223 or for 5.56?
A 5.56 barrel can shoot 5.56 ammo AND .223 ammo.
A .223 barrel can NOT shoot 5.56 ammo.

cfusionpm
04-22-2012, 6:40 PM
I've shot about 500 rounds of that through my Ruger SR-556E piston AR. It cycles a little fast and sometimes jammed nose first into the top of the chamber, but dialing the gas back from 2 to 1 fixed that right up. Otherwise, no issues.

DRUNKENMASTER
04-22-2012, 6:42 PM
I fired off about 300 rounds of this stuff with just 1 misfire.

darmog
04-22-2012, 6:59 PM
Fired a 100 rounds of that stuff today in my new RRA Elite Op2 no problems, but my buddy had issues with that same ammo in his rifle. It was jamming almost every round but he could shoot PMC Bronze and Fed .223 value pack from Walmart no problem. He diagnosed it to be light primer strikes from a new spring he had just installed previously. Changed it back to his stock spring and had no problems every since.

1 SIG fan
04-22-2012, 7:03 PM
Agreed. The delton could be a 223 only. However I dont think it would cause a FT fire... Just a kaboom

Speedpower
04-22-2012, 7:06 PM
XM193 is the only ammo I have ever shot on my SIG556 and all my AR15's, never have an issue, my bet is that the problem is also in the rifle! are the springs installed correctly? not saying it's wrong but I have seen it happen before.

dandingo13
04-22-2012, 7:24 PM
Agreed. The delton could be a 223 only. However I dont think it would cause a FT fire... Just a kaboom

It isn't. Their site states that it's chambered for 5.56x45.

He checked the hammer spring and he's pretty sure that's the culprit. Looks like he put it in wrong. Thanks for all the help!

justin_5585
04-22-2012, 7:59 PM
I second the backwards hammer spring.

TreeHugger
04-22-2012, 8:08 PM
Most nato ammo use a nato primer, which has a hard cup to prevent misfires when loading the same round over and over again in a floating FP design firearm. It takes all the hammer has to offer to get the nato primers to ignite, where you could get away with a lighter hammer/FP strike on a softer/thinner primer cup on some of the 223 ammo's.

peter95
04-22-2012, 9:53 PM
wow really?? must be a bad batch. I ran a thousand straight before and not a single fail.

stitchnicklas
04-22-2012, 10:10 PM
trigger/hammer spring backwards i bet....

Munny$hot
04-22-2012, 11:47 PM
Make shure that both of the hammer spring legs are sitting on top of the trigger pin

Munny$hot
04-22-2012, 11:48 PM
Make shure that both of the hammer spring legs are sitting on top of the trigger pin.

Tacit Blue
04-23-2012, 12:03 AM
So my BIL just finished building his Del-Ton midlength AR with DMPS lower and took it to the range yesterday. He started out with AE 5.56 XM193J 55 grain in the black and white box and said that the firing pin was striking the primers perfectly but the rounds were not going off. He said that out of 150 rounds, this happened in more than FORTY rounds of the AE.

He then switched over to PMC .223 and said that the rifle was running fine. Not a single hiccup. The AE is from Palmetto State Armory. Here it is ...

http://i45.photobucket.com/albums/f89/ukuleledan/c6cf68e6.jpg

I'm hoping it's the ammo and not the rifle. FYI, the lower does say both .223 and 5.56. Thanks in advance.

XM193 is rejected military ammo, It is not real military M193 ammo. I myself thought that XM193 was good ammo, until I've heard about inconsitent power or loads on differen't loads of ammo. I myself have very few issues with it.

OutkastSL
04-23-2012, 10:54 AM
i agree it might be the hammer spring. My buddy swapped to the jp lightweight spring set and accidentally installed it upside-down and it was causing light primer strikes, we fixed it at the range and had no problems after that.

krisjon
04-23-2012, 10:58 AM
Since the gun is a home build, I'd check the installation of the fire control group as others have suggested. It more likely that than the ammo. XM193 isn't perfect, but it's pretty rock solid reliable.

dandingo13
04-24-2012, 7:59 PM
Thanks again for everyone's input. I compared my hammer spring to his and he did put it in upside down. It should run just fine now.

chrisf
04-24-2012, 9:17 PM
Its some of my favorite cheap ammo. Never had a problem.

Stryfe76
05-31-2012, 12:34 PM
You guys ever notice crud on the cases of xm193?
I bought a bunch of American Eagle XM193J and you could scrape specks of dirt off the cases with your finger nail.
I've run it as is when I thought it was just tarnish on the cases without any issues.
Now that I know it's stuff stuck to the cases I've started tumbling the rounds in a HF rock tumbler w/ Walnut to get the dirt and grit off.
I can't see how running dirty cases through your rifle would be a good thing.

818gtiguy
05-31-2012, 4:05 PM
You guys ever notice crud on the cases of xm193?
I bought a bunch of American Eagle XM193J and you could scrape specks of dirt off the cases with your finger nail.
I've run it as is when I thought it was just tarnish on the cases without any issues.
Now that I know it's stuff stuck to the cases I've started tumbling the rounds in a HF rock tumbler w/ Walnut to get the dirt and grit off.
I can't see how running dirty cases through your rifle would be a good thing.

You shouldnt tumble live ammo. Read more here..

http://bulletin.accurateshooter.com/2008/09/why-you-should-not-tumble-clean-loaded-ammo/

Stryfe76
05-31-2012, 4:41 PM
Haven't run into any issues using a rotary tumbler so far, but I won't go as far as to recommend it. There is always someone who will find the magical set of circumstances to blow their face off.

With that stated I routinely tumble ammo from 12 - 48hrs and left a batch of 10x 8mm Mauser rounds in the tumbler for about 2 weeks and noticed no difference between the 2 week, 2 day, and untumbled rounds from that box.

http://www.ar15.com/forums/t_1_5/989047_Tumble_live_ammo_Tumbler_Oandapos__thruth_E XTREME_edition__200hour_torture_test__UPDATE__fire d_rounds_in_OP.html

duc748bip
06-01-2012, 1:19 PM
My only problem with that ammo is that I cannot find it at my favorite online retailer. I guess everyone is stocking up after the blow all of their stash over the long weekend. Essentially I did the samething.. ;) went thru almost a case between me and my friend not a single problem