[Trobes]

Have owned a FN Five-seveN for 8 months and was considering adding an aftermarket barrel to allow the addition of threded accessories. Jarvis makes one:

http://www.jarvis-custom.com/Products/tabid/53/ctl/ProductDetail/productId/43/mid/388/Default.aspx

If you've got one what has your exerpience been? Increase/decrease accuracy at all?

It is intended to allow the Five-seveN to shot surpressed. Has anyone shot one like this?

Thanks in advance,

-Trobes

 

[avery]

I have been wondering the same thing.

I also was wondering how much length it adds to the barrel, and is there any increase in velocity due to the extended barrel?

 

[Promoted Pawn]

All I know is they made a bad lot recently. I don't know it they were all recalled and replaced. For this reason I would be a little weary of any 'good ' deals on second-hand barrels.
That said, I'm thinking of getting one too.

 

[tqtran]

Most of the bad ones from last spring/summer should have been replaced but if you got one of the bad ones, you can just send it in for a new one.

I have a couple 5.7 Jarvis barrels. One on an IOM and one on a USG.
The barrel w/thread protector adds about 1 cm to length.
As for does it increase velocity? I don't know since I don't have a any means to measure it. It may but I wouldn't expect too much.
I have not noticed any accuracy difference when shooting the Jarvis and standard barrel, at least not for me anyway.

As for surpressing it, I don't own a can yet so I can't help you out with that one.

As a side note, you have to take the thread protector off when changing barrels; otherwise, its a PITA! :twisted:

Jarvis on IOM

Jarvis on USG

 

[avery]

I just ordered one and will post my review as soon as I get it in and to the range.

Thanks for the info and pics.

 

[floridafive7]

Ordered mine

I just ordered my barrel. how long has the turn around time been for others?
thanks for the info.

 

[Zhurdan]

As to the velocity question, generally speaking, a barrel will add very little velocity to most rounds. On the order of 20-30fps per inch of barrel. That is a very subjective measurement as velocities between exact batches of ammo can have that same variance. To sum up, there would be a negligeable amount of velocity increase at the lengths your talking about.

Zhur

 

[Fred G Sanford]

I have been wondering the same thing.

I also was wondering how much length it adds to the barrel, and is there any increase in velocity due to the extended barrel?

As just stated above, I do not believe that there would be any noticeable difference in velocity. The longer barrel on the PS90 only grants an extra 200 fps, and that is with an extra 6 inches.

 

[Zhurdan]

Works out to 33.3fps per inch.

Zhur

 

[Orbital]

it shoots great suppressed. Less recoil, faster follow up shots. Haven't really shot it for accuracy yet though.