Failure to Feed

[MWPVLP]

Just got my new MPA DS9 LOC.  It came with 2 MBX 141.25mm mags which I added to my existing mag supply of MBX 141.25mm mags after putting in new springs.  I am experiencing a  failure to feed issue where the round sits on the barrel ramp and the gun fails to go to battery.

 

Of course, the frequency is very random, once a match or so  but you all know what that can do to your match performance.  I have heard several recommendations on a fix from mags springs needing to break in to the feed lips needing to be adjusted.   Every round is case checked and the OAL is 1.15. 

 

Anyone had a similar experience?

[CHA-LEE]

Jams like that are usually Extractor Depth or Tension based. If the extractor hook is too deep inwards to the breach face or there is too much tension then the rim of the case can't get under the extractor hook during the feeding process. Verify that the extractor has the correct setting. If you don't know how to do that, send it back to MPA to do it for you. New guns should run out of the box without issue.

[truespode]

On my MPA DS9 LOC, my OAL with 135 TC Blue Bullets is right around 1.123 and I had double feed issues at matches early on. The first two matches it ran perfect then the two after that I would get a double feed once per match.

I went form the 8lb recoil spring to a 9lb recoil spring and have not had an issue since.

I did check all my MBX magazines for proper dimensions and they were all spot on. Also, checked the extractor and it was holding things correctly as best I could tell so I did not make any adjustments to it but did take it out and cleaned everything really good. It wasn't that dirty though.

I am not a gun smith and only know enough to fix things by trial and error so I can't say this will work with yours but it is a cheap test.

[perttime]

Does it matter which magazine is in the pistol?

[MWPVLP]

No, 3 out of 5 mags have experienced the issue at least once.  Checked the extractor, it seems fine, which kind of makes since based on the low frequency of events.  For example, at a match last weekend it happened once in about 200 rounds.

 

I will look at the recoil spring idea.

 

Thanks so much, to everyone.

[Michaelsabre]

If you do reload, you can try load your ammo shorter. It worked in my CZ.

[CHA-LEE]

If the feed ramp angle and extractor are setup properly it shouldn't matter what lb recoil spring you use in order for the round to chamber reliably. Putting a heavier recoil spring in there to "Solve" the problem only masks the root cause of the issue. 

 

You either "KNOW" the extractor is tuned properly and can effectively rule it out. Or you don't know and it "Seems Fine" which will never rule it out as the root cause of the issue.

 

I hate to say it but I have seen several MPA's with extractors which were fit from the factory by what seems to be the proficiency of a monkey. Every gun manufacture has the potential of sending out a product which was made on a Friday Afternoon with a substandard level of quality. So I don't want to throw MPA specifically under the bus. Manufacturing and Craftsmanship issues can happen on any brand pistol. This is why I suggested that you get this blaster back to MPA so they can assess the build quality and fix what is needed as it should have been done in the first place. These guns are WAY too Expensive to not work 100% out of the box.

Edited Tuesday at 07:23 PM by CHA-LEE

[DrewM]

The reality is that FTF is almost always the extractor (like 95+% of the time).  After that you can look at the ammo given this crowd, if you are shooting some kind of girly-puff type loads, then you may need to tweak the recoil spring - extraction and feeding rely on a certainly amount of slide velocity - so you can ease the extractor a bit, play with recoil and mainsprings, etc - the quick test is how it works with something 'normal' like Blazer Brass.  After that you can look at things like Chamber size, any burrs around the firing pin hole...and then finally feed ramps (in a decent quality gun it will almost never be the feed ramp FYI).  

[MWPVLP]

Well I think CHA-LEE has the answer and back to MPA it goes. 

 

Hey CHA-LEE, it has been a while but we have been squadded together a few times down in Rosenburg, TX.  Hope all is well.

 

Regards,