Frustrating weekend - 6mm ARC

Posted by: Plant.One

Frustrating weekend - 6mm ARC - 11/01/21 06:03 PM

tl:dr - i'm never buying another Ballastic Advantage barrel again.

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as paul harvey would say... and now the rest of the story...


so i finally got my hands on some 6mm arc ammo a few weeks back. been swamped with work (good thing) and finally got around to building the upper i bought a BA barrel for ~10 months ago.

what a hot mess this turned out to be in my adventures of ar gun-plumbering!

my donor upper - BCA 6.5 grendel g1 sidecharger - two of the handguard screws are WAY over torqued in and/or must have a gallon of red loctite on them.

couldnt break them loose by hand, tried my fat wrench at 60 in/lb and nothing but a click. threw a little heat on them. nothing.

broke the tip of my t25 off in one of them with my baby bosch ps42 impactor, and managed to strip a torque's screw head on the other! 900 in/lb impact wouldnt break them loose!

so i grab another upper (18" 223 wylde g2 side charge) decide i'll cobble that together with the bolt from the Grendel upper - [beeep] crush washer wont come off the barrel. wont slide over the threads, wont thread off over the threads. Just sits there in spins in the thread relief laughing at me. I'm guessing some ham-hand ovaled it torqueing the A2 birdcage on there somehow...

so on to upper #3, i'm determined to get this thing assembled - annnnnd success - this one actually disassembles properly.

i now have a upper, bcg, barrel nut, handguard to work with. sweet!



play a little pin the gas tube into the gas block.

shim the barrel nut to get it to index correctly for perfect handguard alignment.

gas block lines up nice and clean.

clean the threads of packing oil to rockset the muzzle device on and... there's no thread relief at the shoulder and the threads stop about a crush washers width from said shoulder. [beeep]? like you cant make this sh!t up.





so i cant use my QD mount, and i cant use my direct thread mount either. thinking to myself "this has got to be a just before lunch friday barrel"

call BA this morning, get thru to the tech dept, explain whats going on...

nope. the barrel is full in spec. exactly how they designed it. i am the first person apparently thats EVER had this problem before with one of their barrels. the QD and direct thread suppressor mounts they've tested all work just fine. sorry we cant help you. thank you for calling have a great day.

i'm paraphrasing... but that was the gist of the conversation. dude was super polite. and about as useful as screen door on a submarine.

i own threaded barrels from a half dozen manufacturers, and have had several threaded by smiths. ive *NEVER* seen a barrel cut like this. i mean.. maybe a half turn thread worth left back there... but never anything like this. they all either have a thread relief cut in before the shoulder or just threads all the way back.

0.096" gap. just a RCH shy of 1/8".


heck even BCA takes the extra 14 seconds of machine time to cut the thread relief in there.



so my barrel is heading off to the smith to get a proper relief cut added to it. thank god ADCO does that for only $30... but sheesh!

highly doubt i'll have it back in time for being able to hunt this upper this season.
Posted by: Tonester

Re: Frustrating weekend - 6mm ARC - 11/01/21 06:28 PM

I want to talk about that "relief" that you mentioned. I have had this issue with another manufacturer. If you take a close look, many barrels do not have an "undercut" or "relief" as you described.

Some manufactures believe that undercut creates a weak spot and will not do it. I happen to have dealt with this issue within the last year.

Take a look at all of your threaded barrels and see what brands do and do not. I have seen an undercut on a really expensive barrel (that was once).

TC
Posted by: Bowhntr6pt

Re: Frustrating weekend - 6mm ARC - 11/01/21 06:37 PM

Hummm… my YHM QD brake went on just fine but honestly I don't recall looking at the threads.

When I get home tonight I'm going to take a look, can't remember if I used a QD brake or QD Flash Suppressor.
The FS does not need timing so I know I wouldn't have used a shim like when using the brake, which needs timing.
Posted by: Kino M

Re: Frustrating weekend - 6mm ARC - 11/01/21 09:54 PM

Sorry to hear your troubles, hopefully it works out for you soon enough to hunt with it, I had a similar terrible experience with Tactical Ordnance barrels from Ritch's precision guns, NEVER AGAIN!!

I'll add Ballistic Advantange to the list of never again!!
Posted by: P&Y

Re: Frustrating weekend - 6mm ARC - 11/03/21 12:58 AM

Plant just know your not alone! I honestly felt like I was reading one of my escapades! You even used my line "you can't make this sh!t up". Hang in there!
Posted by: Plant.One

Re: Frustrating weekend - 6mm ARC - 11/03/21 12:49 PM

Originally Posted By: Tonester
I want to talk about that "relief" that you mentioned. I have had this issue with another manufacturer. If you take a close look, many barrels do not have an "undercut" or "relief" as you described.

Some manufactures believe that undercut creates a weak spot and will not do it. I happen to have dealt with this issue within the last year.

Take a look at all of your threaded barrels and see what brands do and do not. I have seen an undercut on a really expensive barrel (that was once).

TC


all of my barrels either have the releif cut or threads that go all the way to the shoulder of the barrel.

this is the only one with a nearly 1/8" thick band of nothing thats full thread diamater.
Posted by: Plant.One

Re: Frustrating weekend - 6mm ARC - 11/03/21 01:10 PM

Originally Posted By: Bowhntr6pt
Hummm… my YHM QD brake went on just fine but honestly I don't recall looking at the threads.

When I get home tonight I'm going to take a look, can't remember if I used a QD brake or QD Flash Suppressor.
The FS does not need timing so I know I wouldn't have used a shim like when using the brake, which needs timing.



i'm sure there's mounts out there that have a recess to accommodate for a thread pattern like this.

unfortunately the system i'm using doesnt.

i have a form1 can - which i could adapt - but i would be hundreds of dollars in to switch to the YHM phandom QD to accommodate one of their qd muzzle devices. and that price would only be to make this one barrel work.

likewise they've got SICO ASR adapter i could thread into my rear thread adapter... but again... i'd be $300 deep to make that happen. (adapter, the asr mount, asr qd muzzle device) for a single barrel.

releife cut at the smith is gonna cost about $60 including shipping both ways.
Posted by: Plant.One

Re: Frustrating weekend - 6mm ARC - 11/03/21 01:14 PM

Originally Posted By: Kino M
Sorry to hear your troubles, hopefully it works out for you soon enough to hunt with it, I had a similar terrible experience with Tactical Ordnance barrels from Ritch's precision guns, NEVER AGAIN!!

I'll add Ballistic Advantange to the list of never again!!


thats wild - my 6x45 barrel from Ritch's threaded right up with the same mount system. in fact it was so close, i didnt even have to shim it to index the flash hider. sorry but i'm not soaking the rockset out to check if its threaded all the way back or if its got a relief cut lol
Posted by: Plant.One

Re: Frustrating weekend - 6mm ARC - 11/03/21 01:17 PM

Originally Posted By: P&Y
Plant just know your not alone! I honestly felt like I was reading one of my escapades! You even used my line "you can't make this sh!t up". Hang in there!


lol thanks. i was VERY frustrated about it.

it'll be heading to the smith tomorrow and i should have it back in about it a week.

just annoying to get a delay on something like this i've waited so long to be able to finally enjoy.