Help me find and choose a 6" (!!!) 300blk barrel - Updated

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dan9591
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Help me find and choose a 6" (!!!) 300blk barrel - Updated

Post by dan9591 » Sun Jun 15, 2014 11:25 pm

I finally got my stamp for a thunderbeast arms 30pss suppressor.

I want to go with a 7.5" barrel for this 300 blackout build. Yes, I've cleared it for warranty with this barrel length.

I will ONLY shoot suppressed through this setup. Pretty much just Remington 220 grain ammo.

These are the only 7.5" barrels I've found so far:

http://www.icearms.us/products.cfm?show=952
http://www.tacticalambush.com/75-300-BL ... p_169.html

I know Ice Arms doesn't have the best reputation and I have never even heard of tactical ambush.

Requests for info such as gas port diameter have gone unanswered. Just in case, I will run this with an SLR rifle works adjustable gas block: http://slrrifleworks.com/index.php?rout ... duct_id=84

Are there any other manufacturers out there with a 7.5" 300blk offering? Maybe a custom job?

Please do not suggest a longer barrel. I'm pretty set on 7.5". Build quality, manufacturer reputation, proper gas port sizing and concentric threading are obviously critical and I don't mind paying a premium price for a premium barrel, but I also don't want to spend $500.

Please help me on this one, guys! I've spent 3 months staring at my engraved lower searching for the perfect barrel and now that I have the can its even more agonizing!
Last edited by dan9591 on Wed Jun 18, 2014 2:06 pm, edited 1 time in total.

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eastern_hunter
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Re: Help me find and choose a 7.5" 300blk barrel

Post by eastern_hunter » Mon Jun 16, 2014 4:32 pm

I bought a melonited CMMG 8.5" 300 BLK barrel before learning that they have a reputation for concentricity problems. Was lucky and mine is fine.

I also have a 16" barrel made by Paladin Machine Services. He has a great reputation and does beautiful work! Has done other things for me including a short 338 Spectre barrel and every thing he has done has been perfect! Paladin did many of the Teppo Jutsu barrels.

Were I to build another one ... would be done by Paladin! He isn't cheap ... but not in the $500 range either!

S4area51
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Re: Help me find and choose a 7.5" 300blk barrel

Post by S4area51 » Mon Jun 16, 2014 7:28 pm

If budget is not an issue, I would look into Rainier's Ultramatch(Shilen blanks I believe) BUT, they are 1" longer then your requested 7.5".
I have the CMMG WASP 8.5", and it runs like a top. I have read about concentricity issues, but I think they have all been addressed by now. Groups well with subs all the way to supers. (tested some 125SMK's and accuracy wasn't that bad :o )
Image
EDIT; I have the CMMG 8.5" not 7.5(I don't think they make that length)
Last edited by S4area51 on Tue Jun 17, 2014 7:12 pm, edited 2 times in total.

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Emilio
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Re: Help me find and choose a 7.5" 300blk barrel

Post by Emilio » Tue Jun 17, 2014 3:25 pm

Member of the LSU, SWR, and RUGGED underground. Shame Silencerco!

dan9591
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Re: Help me find and choose a 7.5" 300blk barrel

Post by dan9591 » Wed Jun 18, 2014 2:03 pm

Well, I am rethinking this and I believe it is time to do something stupid...

7.5" is just too boring. I already have a 7.5" 5.56 AR and duplicating it in a different caliber is just not "enough".

So... I am going to go 6". It seems that Ice Arms offers the shortest commercially available barrel at 6.75". The added .75" doesn't really bother me, it's more their reputation and inability to guarantee anything.

I got in touch with a couple barrel manufacturers including Paladin and Lothar Walther (as recommended earlier in this thread) to start. Both are quoting around $400, which is OK for my budget. Any other manufacturers I should consider?

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Re: Help me find and choose a 7.5" 300blk barrel

Post by Bendersquint » Wed Jun 18, 2014 5:18 pm

dan9591 wrote:Well, I am rethinking this and I believe it is time to do something stupid...

7.5" is just too boring. I already have a 7.5" 5.56 AR and duplicating it in a different caliber is just not "enough".

So... I am going to go 6". It seems that Ice Arms offers the shortest commercially available barrel at 6.75". The added .75" doesn't really bother me, it's more their reputation and inability to guarantee anything.

I got in touch with a couple barrel manufacturers including Paladin and Lothar Walther (as recommended earlier in this thread) to start. Both are quoting around $400, which is OK for my budget. Any other manufacturers I should consider?
$400 for a 6" 300BLK barrel? :shock:

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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by CThomas » Wed Jun 18, 2014 5:33 pm

Op giving me a headache with his 6" 7.5 inch switching DERP.

FYI if you did go with a Paladin barrel. Do not get a barrel with an on/off button. The button gets fouled with as little as one round which makes the button useless unless you have a punch and hammer with you. I thought it would be cool to be able to make it a single shot if I wanted but quickly found out about it poor design.

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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by Will_M » Wed Jun 18, 2014 7:13 pm

I have a guy who custom cut me an 8" from a Pac-Nor blank for $265. He would do a 6" no questions asked. It turned out very well and I wouldn't hesitate to order from him again.

PM me for info.
Last edited by Will_M on Wed Jun 18, 2014 7:39 pm, edited 1 time in total.

dan9591
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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by dan9591 » Wed Jun 18, 2014 7:34 pm

Bender - Yeah, they want $400 but will guarantee stability using 187 and 220 grain projectiles.

CThomas - Agreed. no on/off switch.

Will_M - PM inbound

What is the consensus on Houston Armory? They have a 6" in stock for $235 and it does look like they have a decent track record with short barreled 300blk...

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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by 57fairlane » Wed Jun 18, 2014 10:48 pm

dan9591 wrote:Bender - Yeah, they want $400 but will guarantee stability using 187 and 220 grain projectiles.
what twist? 1:4????

Good luck getting it to cycle at 6" . . . I guess if you only shoot suppressed you stand a chance.

dan9591
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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by dan9591 » Wed Jun 18, 2014 11:00 pm

57fairlane wrote:
dan9591 wrote:Bender - Yeah, they want $400 but will guarantee stability using 187 and 220 grain projectiles.
what twist? 1:4????

Good luck getting it to cycle at 6" . . . I guess if you only shoot suppressed you stand a chance.
1:8. Yeah, I thought it should be faster, but everyone I have spoken to have said 1:8 is the way to go. Apparently Houston Armory has sold a bunch of 6" with 1:8 twist, but I can't seem to find too many reviews on them.

If I have Walther Lothar build it, I may insist on 1:7.

Yeah, it will only be run suppressed. I was thinking of a large gas port, around .10, and then taming it with an adjustable gas block if needed.

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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by saigatechusa » Fri Jun 20, 2014 12:59 pm

dan9591 wrote:
57fairlane wrote:
dan9591 wrote:Bender - Yeah, they want $400 but will guarantee stability using 187 and 220 grain projectiles.
what twist? 1:4????

Good luck getting it to cycle at 6" . . . I guess if you only shoot suppressed you stand a chance.
1:8. Yeah, I thought it should be faster, but everyone I have spoken to have said 1:8 is the way to go. Apparently Houston Armory has sold a bunch of 6" with 1:8 twist, but I can't seem to find too many reviews on them.

If I have Walther Lothar build it, I may insist on 1:7.

Yeah, it will only be run suppressed. I was thinking of a large gas port, around .10, and then taming it with an adjustable gas block if needed.


My wilson combat 10.3" with pistal length gas system came with .108" gas port and it has a lot of dwell time

It cycles 108's with 10gr 1680 @ 1030fps perfectly w/suppressor

You may have to go even larger but limiting factor is the gas tube I.D around .115"

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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by Joker31D » Tue Jun 24, 2014 2:01 am

Satern Custom Machining.
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Re: Help me find and choose a 7.5" 300blk barrel

Post by thomasnelson » Tue Jun 24, 2014 9:00 am

eastern_hunter wrote:I bought a melonited CMMG 8.5" 300 BLK barrel before learning that they have a reputation for concentricity problems. Was lucky and mine is fine.
I also own a CMMG Barrel. I have had zero problems with it. Before buying I called CMMG and spoke with a sales rep to ask about the concerns of many about the concentricity issues. I was told that a few bad barrels made it pass QC but that problem has been corrected. He also told me that when I was ready to purchase, to call in and specify that the barrel will be used with a suppressor and they will hand select the barrel and verify it is 100% concentric before shipping.

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Re: Help me find and choose a 6" (!!!) 300blk barrel - Updat

Post by redtazdog » Thu Jun 26, 2014 11:36 pm

57fairlane wrote:
dan9591 wrote:Bender - Yeah, they want $400 but will guarantee stability using 187 and 220 grain projectiles.
what twist? 1:4????

Good luck getting it to cycle at 6" . . . I guess if you only shoot suppressed you stand a chance.
I have cut many AR 300 barrels down to 6.5" and tuned them to run good with and without a can with 220+ grn sub ammo.
That .5 inch less could be the limit of cycle or not without a can, I don't know as 6.5 is the shortest I have gone.
I do know a 300 blackout 6" barrel TC will cycle good though :wink:

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