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| |-+  K&M Arms M17S 5.56 and .308
| | |-+  Custom Aftermarket Barrels Now Available!
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Author Topic: Custom Aftermarket Barrels Now Available!  (Read 3146 times)
Tinglyfeet9
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« on: November 09, 2019, 09:56:31 PM »

Quick heads up for anyone interested in an aftermarket barrel for their K&M M17s.  Fink's Custom Gunsmithing in AZ: https://www.finksguns.com/ can spin one up for you.  Either you provide the barrel blank and parts purchased separately from K&M (just the barrel extension and gas block really) or you can have Fink's order them in for you.  Wait time is 6-8 weeks after they have the parts in hand usually.  You can send your rifle in to have the barrel fitted (necessary if you are doing a new cartridge or barrel length) or just have them send you the barrel and swap it out yourself which is pretty easy.  They are also partnered with a proper nitride outfit so they can nitride anything.

I have one from them which you can read more about in the other thread but the TL;DR is that is it a big accuracy upgrade over stock and working with Fink's was a pleasure.
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Leadlobber
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« Reply #1 on: November 10, 2019, 12:30:43 AM »

Okay - I have an M17s 308 and would like an improvement
In accuracy and velocity.  How much for an 18 inch
barrel installed. Nitrided of course.
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ttarp
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« Reply #2 on: November 10, 2019, 07:41:07 AM »

Cool, good to see a bit of an aftermarket start forming.  Thanks for spearheading this.
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Tinglyfeet9
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« Reply #3 on: November 10, 2019, 10:34:49 AM »

So the extensions+gas block and related parts/pins from K&M is around $200.

The blank is whatever you want to pay for a blank.  I got a Rock Creek cut rifled 5R gain-twist for around $215.  But you can go ham and get a Bartlein blank for around $320, or get a Criterion blank for significantly less.

Then you have labor which is by the hour, shouldn't be much more than a few hours to get it done.  They told me it will be pretty cheap since they are all set up to do them now.

Then optionally you  have nitriding which is another $120 or so and a little additional labor for that.

So really it can be as cheap as around $400 or as expensive as around $900 depending on the blank you get and how you get it finished.

So really close to what it costs to get a quality AR10 barrel from someone like Craddock Precision.

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Leadlobber
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« Reply #4 on: November 10, 2019, 06:19:11 PM »

Another thing Iíd like is an AR style safety
Iím having trouble with the cross bolt safety. 
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Tinglyfeet9
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« Reply #5 on: November 10, 2019, 09:37:23 PM »

Yeah I have large-ish hands and the safety is just within reach for me.  Easy to take off, harder to put back on.  Not an issue for me, but I agree it could be for others and an AR style would be better.  However, I do not believe there is space in the design unless it was a very small safety.  Would require a bit of a redesign of the grip/trigger guard area as far as I can see.

Also, forgot to mention on the barrels most smiths should be able to do this as the project isn't that difficult, Finks is just already set up so it will probably be a lot cheaper through them.
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Leadlobber
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« Reply #6 on: November 11, 2019, 07:27:24 PM »

Thank you for the barrel data.  The trouble I have with the safety is
my trigger hand thumb looks for it - canít find it - then I remember
I need to use my support hand thumb. Very awkward. 
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Leadlobber
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« Reply #7 on: November 16, 2019, 05:20:48 PM »

I watched Kenís video on removing barrel.  Looks very simple.
Iíve not removed my barrel yet - question is the diameter of the
gas block a standard .750? 
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Tinglyfeet9
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« Reply #8 on: November 18, 2019, 04:18:02 PM »

Not 100% sure.  Ken will send you the drawings if you want them.  It isn't a standard gas block, that is for sure.  But the journal may be.
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Leadlobber
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« Reply #9 on: November 25, 2019, 12:15:17 PM »

Reference improvement in accuracy and velocity
I chronographed (Ohler 35 P) my stock 16 barrel KM 308 with a 168 grain Sierra tipped Matchking.  A 10 shot string average velocity 2620 FPS SD 16 FPS.  Same load with OSS helix 10 shots 2597 SD 10fps.  For comparison the same load from a 20 Inch AR 10 2728 SD 14 FPS.  How much velocity did your new barrel yield?
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Tinglyfeet9
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« Reply #10 on: November 25, 2019, 10:54:16 PM »

Went from 2900fps with 150gr handloads to 3100fps with 150gr handloads.  Went from 2600fps with factory 168gr ELDMs to 2760fps with factory 168gr ELDMs.  This was with a 1.5in increase over stock. Testing more soon.  I'd expect anywhere from 50-200fps depending upon the blank chosen and the length you go with.
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Leadlobber
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« Reply #11 on: November 25, 2019, 11:58:35 PM »

Wow those are nice numbers.  Your new barrel is 20 inches?
I contacted Finks - waiting reply. 
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Tinglyfeet9
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« Reply #12 on: November 27, 2019, 01:24:28 PM »

Went from 20in to almost 22in.  Wanted those 150grs over 3000fps (the magic number) and was very surprised how easy that was to do with handloads now.  Probably going to settle on a node just shy of 3000fps though.

My experience with Fink's is they usually get back within about 2-3 days which for a busy small independent machine shop/gunsmith is pretty good.  They seem really busy now so it might be longer around the Holidays, if you don't hear back in a few days just call and/or email again.
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martini577450
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« Reply #13 on: April 27, 2020, 01:14:29 AM »

Am I right in thinking to do a 7.62x39mm, I need the barrel and 308 bolt AND carrier in a 5,56 rifle?
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Leadlobber
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« Reply #14 on: April 30, 2020, 08:16:04 AM »

Not quite 7.62 x 39 case head .447.  308 Win or 7.62 x 51 is .473.  Youíd need a 7.62 x 39 bolt.
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martini577450
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« Reply #15 on: May 01, 2020, 03:26:22 AM »

Not quite 7.62 x 39 case head .447.  308 Win or 7.62 x 51 is .473.  Youíd need a 7.62 x 39 bolt.

I didn't know that, thanks!
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