EFK vs Jarvis

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panzermk2
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EFK vs Jarvis

Post by panzermk2 » 01 Sep 2013, 12:55

Just a little side by side. This EFK is from my personal FsN and has 10k+ through it hence the scratches. It has seen some hard use.


I decided to do this since on a certain other form some stupid asshats who don't have a clue keep going on about how the Jarvis barrel is so much better then the EFK. These arrogant gas bags are doing this only because EA decided to go with EFK over Jarvis.

It is amazing too me how those folks get any credit at all for knowing anything at all.

EFK is longer.

Otherwise for starters the over all feel of the EFK is better. Finish on the barrels where they were turned is much better on the EFK. The Jarvis is very coarse, readily visible and felt turning marks. You can even feel them when you cycle the slide.

The finish of the spring retainer really stands out. If you look at the Jarvis where it meets the slide is very stepped and does not have as smooth a transition as the EFK.

If you look closely the Jarvis barrel steps down after the retainer effectively reducing the with and depth of the channel wall of the retaining clip.

Jarvis also short cut making the retainer. If you look you will see that you can not see the clip on the EFK. EFK creates a channel in the retainer for the clip. Not only does this mimic the factory barrel, gives a cleaner appearance it also keeps the clip from loosening up.



This is very important as guys have learned the hard way that it is easy to tweak the spring clip. With the EFK you have a full channel AND the retainer OVER the top of it holding it in place.

On the Jarvis you see the clip exposed AND in a shallow sides channel creating a failure point.



One more thing. If you look at where the threading ends at the chamber end you will see a nice gap on the EFK and the high shoulder of the barrel. This gives you a nice base to tighten against and not damage your threads. With the Jarvis it's much easier to over tighten your barrel appliance and damage threads.

Another pet peeve of mine is the tread protector. The Jarvis has a crappy roll stamped knurling reminiscent of 1980 shitty Colt slide roll stamping. The EFK thread protector has a nice .075 raised band that is then MACHINE knurled instead of some crappy uneven roll stamp.
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Clearly visible step and expose ring clip on the Jarvis and enclosed EFK.

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Shitty thread protector. If they cut corners where here else have they cut corners?

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The net affect is the EFK is a much higher quality product at every level in addition to a better chamber. I touched on that in this video I made.
Jay Wolf
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karbuv
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Re: EFK vs Jarvis

Post by karbuv » 11 Sep 2013, 07:46

Jay, thank you very much for the comparison review of these replacement barrels. Your review is timely as a new barrel is in my future.
You mention "The net affect is the EFK is a much higher quality product at every level in addition to a better chamber." What makes the chamber better? Your comment makes me think about the case and especially the case necks that are moved and reshaped when fired as well as reformed by the dies during reloading, so is one better for reloads than the other, and how are the EFK and Jarvis chambers compared to the factory barrel chamber?
A new barrel is in my future so I am trying to evaluate them, of course, the availability may influence my purchase.

Thank you very much for your time, effort and expert input!

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Re: EFK vs Jarvis

Post by panzermk2 » 11 Sep 2013, 08:57

In the shoulder area where this round has failed the chambers on the Jarvis over sized causing the neck and shoulder to move even more then normal. It stresses an already stressed area. Plus the finish on the chamber up by the shoulder has large amounts of cutting chatter.
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fd57
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Re: EFK vs Jarvis

Post by fd57 » 11 Sep 2013, 12:41

panzermk2 wrote:In the shoulder area where this round has failed the chambers on the Jarvis over sized causing the neck and shoulder to move even more then normal. It stresses an already stressed area. Plus the finish on the chamber up by the shoulder has large amounts of cutting chatter.
Jay -

Which Jarvis barrel or barrels are you referencing? What year of manufacture?

Asking because according to Jarvis they addressed this issue at least 2 years back, so barrels from 2012 and 2013 should not be described as such. But don't know, so asking if you've analyzed barrels from 2012 and 2013.

Thanks!

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Re: EFK vs Jarvis

Post by panzermk2 » 12 Sep 2013, 13:14

I not sure of the date of manufacture of the Jarvis barrel I had for the side by side. It was purchased about 2 months ago. The chamber needed a great deal more polishing in the neck area then the EFK's ever do. I have not test fired it yet as it was part of a deal when the customer bought a suppressor. He has ordered and EFK from us and is waiting on it.

When I get a chance I will test fire it and see how much the shoulder bulges out.
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karbuv
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Re: EFK vs Jarvis

Post by karbuv » 13 Sep 2013, 10:40

Jay, thank you for the info. Unless Jarvis has fixed this it appears I need to get an EFK barrel. Polishing a chamber is doable but adding material where it's been milled is beyond my ability. Maybe Jarvis has fixed these issues, perhaps someone will have some input on a recent production Jarvis barrels' chamber neck area and chatter marks. Another question along these lines...can annealing or anything else be done to these case, (necks), to make them more durable. Has something new come along in this area, my apologies for asking an old pesky question?

Again, thank you for sharing your knowledge.

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Re: EFK vs Jarvis

Post by fd57 » 13 Sep 2013, 11:03

Jay -

Can you post a photo with the areas highlighted where you found issues in the 2 month old Jarvis barrel?

Thanks!

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Re: EFK vs Jarvis

Post by panzermk2 » 14 Sep 2013, 09:38

fd57 wrote:Jay -

Can you post a photo with the areas highlighted where you found issues in the 2 month old Jarvis barrel?

Thanks!

I did above concerning the construction. We have polished the chamber but Like I said I still need to test fire it.
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Re: EFK vs Jarvis

Post by s-industries » 20 Sep 2013, 22:30

Jay, do you think the exposed ring clip is really an issue? My factory barrel has an exposed clip and has had zero problems. Aside from the possible issues, have there been any documented problems with this aspect?

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Re: EFK vs Jarvis

Post by panzermk2 » 21 Sep 2013, 16:45

s-industries wrote:Jay, do you think the exposed ring clip is really an issue? My factory barrel has an exposed clip and has had zero problems. Aside from the possible issues, have there been any documented problems with this aspect?

My issue is that and the step down. Talk to anyone here who changed out their recoil spring and used a pocket knife to remove the clip. It never went back on correctly. I have had to send a few out.

With the recoil impulse of the FsN, the uncovered clip AND the fact is does not sit in a full channel concerns me.
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Re: EFK vs Jarvis

Post by 748 » 25 Dec 2014, 21:09

I put my EFK barrel on back in 2009 or 2010 I think it was. I was back when you could order the barrel, but you had to wait 4 months for it to come in. I dropped it in and the gun didn't miss a beat.
If you want some quick cash I sold my OE barrel for $170, on ebay last year when I was reducing my "stuff I don't use inventory".

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Re: EFK vs Jarvis

Post by panzermk2 » 26 Dec 2014, 12:17

Unfortunately depending on when you place your order and when the are ran the wait could be as high as 3 months. We order extra though and EFK sets barrel aside just for us above what we order from every run.

I have to add EFK's customer service from a dealer side really kicks ass.
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DoubleJ
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Re: EFK vs Jarvis

Post by DoubleJ » 26 Dec 2014, 15:13

FYI, EFK has shortened their barrel now, I compared my brand new EA'd one to a slightly older one and it's considerably shorter.

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Re: EFK vs Jarvis

Post by panzermk2 » 28 Dec 2014, 09:53

Yeah I will be covering that in the next coffee chat.

EFK stated that so many customers complained about the aesthetics of the longer barrel and slide gap that they shortened it.
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Re: EFK vs Jarvis

Post by bruteandbear1 » 28 Dec 2014, 18:46

I don't have a problem at all with the longer barrel I got from EFK, the more velocity the better for my applications. I have put over a thousand rounds through my EFK barrel and the only issue I have that I don't have in my factory barrel is the shoulder gets blown out more. So I have to go about .2 tenths of a grain lower on my reloads for me to feel safe shooting it out of my EFK barrel which is fine.

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Re: EFK vs Jarvis

Post by 748 » 28 Dec 2014, 19:00

I defiantly have the older longer EFK barrel and don't have any problem with it.

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Re: EFK vs Jarvis

Post by DoubleJ » 29 Dec 2014, 03:25

Will you be re designing your thread adapter to make up for the loss in barrel length?

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Re: EFK vs Jarvis

Post by panzermk2 » 29 Dec 2014, 14:42

No it does not need to be.

EFK stops the threads and leaves a gap and a shoulder to run your adapter/accessory up tight against. My unit has been designed from the outset to stop at this shoulder.



Unlike Jarvis that does not.
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Re: EFK vs Jarvis

Post by Middian » 29 Dec 2014, 17:47

Nice info, thanks! I asked for this barrel from the wife for Xmas. Once she gets back from a trip up north, I shall be putting in my order!

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Re: EFK vs Jarvis

Post by bruteandbear1 » 30 Dec 2014, 15:16

panzermk2 wrote:Yeah I will be covering that in the next coffee chat.

EFK stated that so many customers complained about the aesthetics of the longer barrel and slide gap that they shortened it.
I thought you said the EFK was longer than the Jarvis. I do have a long EFK barrel and a new short one barrel from EFK. Did EFK switch to the Jarvis length because it is engineered and tested as a better length?

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