Range Time Update - Primer Strike Issues and ammo choices

[douglasdorsi]

This is in followup to my original post which has been closed. I finally took my fs2000 to the range for firing the first time. Serial number is 0502xx. I did not have any failure to fires with 5.56 American Eagle XM193c 55 gr. or Winchester Q3131A1 (korea) 55 gr. These were packaged in 20 round boxes. I only tried 223 in Federal 55 gr (Anoka MN USA - 100 round value pack that I found at Walmart on a fluke). On the AR-15 forums they say this is good practice ammo. This ammo failed to feed after the first 2 to three rounds in a partially loaded (approx 10 rounds) in a 30 round magazine. These failures ended up with the bolt left partially open, the cartrige severely dented by the chamber lugs. and the follower of the standard 30 round FN magazine tilted approx 30 degrees with more damaged rounds in the magazine.

The ammunition looked fine but i did notice that the 223 rounds are slightly shorter than the 5.56. I did not notice any damage to the bullet or it's tip at all. I tried switching the gas diverter to divert more gas to the operating mechanisim but htis made no difference.

I alternated ammo types every clip, only partially filled the clips and only had failure to feed with the 223. All the other ammo feed and fired reliably. This was not an extensive test as the total rounds fired was approx 250. On the AR-15 forums they say this is good reliable practice ammo.

I am a newbe to the forum and have owned other firearms but my knowledge is basic and do not understand how this type of problem occurs. Any suggestions as to the problem?[/img]

[jhs27275]

If you'll look at the barrel it's marked 5.56 not .223. Use the correct ammo and you should not have any problems.

[Hirudin]

^ How helpful.

Glad to hear you didn't have any light strike issues!

I recall some people saying that you may have some issues during the first few hundred rounds and that it's not really worth worrying about too much as long as it doesn't keep happening past the ~300th shot.

I had a failure to feed with my 3rd or so round using the FN magazine as well. I pretty much wrote-off the magazine and stopped using it. I've had a couple using an "EZ-Mag" (but I fired hundreds of bullets using that magazine).

Since I started using a modified 20-round PMag I haven't had a single feed issue.

[SgtStrykerUSMC43]

To give you an understanding as to feeding the gun what it is supposed to eat, and this goes for any centerfire gas gun.:

Take a BB, and stand ten feet from your picture window at the front of your house. Throw the BB at the glass, with as much velocity as you can. Then try doing the same thing, 10 feet, as much velocity as you can, with a rock the size of a baseball.

I assure you the BB will bounce off and the rock will travel unabated into the living room. It's all about that wise-ass Newton and that whole equal and opposite crap.

Another analogy would be to hold a bolt action rifle in .308 caliber at the waist and fire it. Then try the same thing with a M-134A mini-gun with a 1000 round belt at 3000 rpm. The mini-gun will corkscrew you into the ground. Why is that? Both guns are the same caliber...

Physics. I hate it.

PEACE THROUGH STRENGTH

[douglasdorsi]

Thanks for the practical comments. I did nt realize 223 would be a problem in this 5.56 gun, but alas I am a newbe.

I will also try the P-Mag. I have seen a test somewhere where it outperformed the H&K magazine which is supposed to be good as well. Actually it performed as well I believe but survived drop tests better. Not that I intend to drop my magazines.

[jhs27275]

I did nt realize 223 would be a problem in this 5.56 gun

In some guns it's not as big an issue, but .223 and 5.56 are not the same thing. The barrel is stamped with the round the gun is chambered for.

http://www.winchester.com/lawenforce...spx?storyid=11

[jhs27275]

^ How helpful.

I thought so.

[fltsrgn]

I thought it was ok to use 223 in a 5.56, and death if a 5.56 is used in a 223....

I've had no problems using 223, even the dreaded Wolf. I avoid Wolf now as it leaves far too much dirt.

[jhs27275]

I thought it was ok to use 223 in a 5.56, and death if a 5.56 is used in a 223....

Usually correct. But even if it works you'll never know what the gun is capable of.

[sean3686]

yes the 556 and 223 saga never ends.

yes a 556 chamber will shoot 223. however you may loose some accuracy. there is a slight difference.
the 556 is a hot 223 with a thicker case wall.

the Wylde chaimber is the best of both worlds you maintain a constant accuracy for both not better with one vs the other.

Designed by and named after Bill Wylde, this chambering was created for High Power shooters after the 80 grain .224" bullets became popular. While the Wylde chamber allows for optimal seating depth of 80 grain bullets over .223 Remington and 5.56 NATO, it is capable of accepting both ammunition types. The Wylde chamber is used by a few manufacturers who sell "National Match" configuration AR-15 rifle, barrels, and upper receivers.