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Posted: 6/24/2021 5:04:41 PM EDT
[#1]
BA makes a 6" that is in stock right now. https://www.ballisticadvantage.com/6-300-blackout-pistol-length-ar-15-barrel-modern-series.html
KAK makes a 4.75" that is in stock right now (6" is out of stock and is stainless steel). https://www.kakindustry.com/ar-15-parts/upper-parts/barrels/300-blk/kak-value-line-300-blackout-4-75-inch-melonite-barrel |
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Posted: 6/24/2021 5:15:42 PM EDT
[#2]
There may or may not be a very short PDW style upper on the way from a well known manufacturer. I would suspect in the next month or so.
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Posted: 6/24/2021 9:49:41 PM EDT
[#3]
Thanks for the suggestions. I know I could buy a barrel and assemble an upper but I'd rather buy a complete barreled upper receiver.
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Posted: 6/24/2021 10:33:25 PM EDT
[#4]
Andro Corp has a 7.5” upper. Or is that a little too big?
https://androcorpind.com/product/ar15-300-blackout-8-inch-mlok-no-bcg-charging-handle-g-blem/ |
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Posted: 6/25/2021 3:27:29 PM EDT
[#5]
Actually I'd like a 5 inch upper.
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Posted: 6/26/2021 10:03:45 AM EDT
[#6]
I got my 5” barrel from Andro. Stand up outfit they are.
ETA: it was an SLR barrel bought from Andro actually. Veritas Tactical also carries them and I had one of theirs first. It was short chambered and had to go back, hence the SLR. |
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Posted: 6/26/2021 9:58:27 PM EDT
[#7]
I've ran across some stuff on Veritas. Unfortunately, their website is a little difficult to negotiate. I've found several short barrels but I'd really prefer to buy a complete barreled upper assembly. I'm not really wanting to build a complete upper.
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Posted: 6/27/2021 6:47:09 PM EDT
[#8]
Quote HistoryQuoted: Thanks for the suggestions. I know I could buy a barrel and assemble an upper but I'd rather buy a complete barreled upper receiver. Ger ahold of Kurt from KAK Industries. He will hook you up with a complete upper. They do great work. My McClain 12.5 inch 308 upper is rocking great from them. |
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Posted: 6/28/2021 4:32:24 PM EDT
[#9]
Thanks Bearcat24. I was wondering if one of the companies mentioned would be willing to build and sell me a barreled upper.
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Posted: 6/28/2021 11:46:08 PM EDT
[#10]
Saw a BA 6" barrel in the EE eailier
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Posted: 7/5/2021 6:53:29 AM EDT
[#11]
I’ve been happy with masdefense BA barreled uppers.
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Posted: 7/5/2021 3:09:42 PM EDT
[#12]
My first pistol build was with a MAS Defense 7.5" .556 upper. I wound up selling it though once I discovered how much .556 ballistics decrease out of that short of a barrel. I used the money to build a 300 Blackout. This has led me to wanting an ultra short, inexpensive 300 Blackout as a truck gun.
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Posted: 7/28/2021 3:47:59 PM EDT
[#13]
Quote HistoryQuoted: Ger ahold of Kurt from KAK Industries. He will hook you up with a complete upper. They do great work. My McClain 12.5 inch 308 upper is rocking great from them. Thanks for the advice Bearcat24! I emailed Kurt and told him what I had in mind. He emailed me back immediately with a couple of options along with prices. I went with KAK's 4.75 inch nitride barrel, a micro flash can and a 5.5 M-Lok rail with one of their uppers and bolt carrier groups. It arrived at my door in just a few days! I was amazed at how fast KAK Industry was able to assemble a custom build and have it delivered! I mounted the KAK upper onto a Palmetto State Armory MFT Battlelink pistol lower and topped it with a Bushnell TRS-26 red dot. After today's trip to the range to sight in the optic and check functioning, I am thrilled! |
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Posted: 7/29/2021 3:22:15 AM EDT
[#14]
I built this using a (I think) right to bare arms 6in 300 blackout barrel and a gibbz side charger upper. It is an SBR. It works great with supers suppressed or unsuppressed, but subs only work suppressed, which is fine because I only shoot subs suppressed.
 Attached File |
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Posted: 7/29/2021 4:46:11 PM EDT
[#15]
Nice! I really thought a lot about a pistol caliber PDW. But I read a lot of post about 9mm AR's not feeding hollowpoints reliably and thought what good is that for personal defense? I'm not building a range toy. 45 hardball is decent but that meant adding another caliber of ammo, plus magazines to the inventory. Since I already own a 300 Blackout and have an inventory of magazines, it just made sense for my situation and needs.
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Posted: 8/5/2021 2:42:56 PM EDT
[#16]
BCM has released this one. 7" upper, multiple rail choices. I have one in hand now, I have not had a chance to test it yet. I have been told it runs reliably, and is best used with an H2 buffer. And they are in stock as of this post.
Caliber: 300 BlackoutBarrel Length: 7" Barrel Material: 11595E Spec Steel Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267) Bore & Chamber: Chrome Lined Weight: 2.2 lbs Twist Rate: 1:7 Gas System: Pistol Muzzle Device: 762/300BLK Flash Hider Muzzle Threads: 5/8x24 Handguard: KMR-A5 https://bravocompanyusa.com/bcm-standard-7-300-blackout-upper-receiver-group-w-kmr-a5-handguard/   |
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Posted: 8/5/2021 4:02:52 PM EDT
[#17]
I have the KAK 4.75" barrel in 5.56mm and I am very happy with it. It is a real blast to shoot. I have had not feeding or firing issues even with a super short barrel and gas system.
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Posted: 8/5/2021 4:21:52 PM EDT
[#18]
That BCM is nice! And glad to hear from another satisfied KAK customer!
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Posted: 8/7/2021 5:35:17 PM EDT
[#19]
Quote HistoryQuoted: BCM has released this one. 7" upper, multiple rail choices. I have one in hand now, I have not had a chance to test it yet. I have been told it runs reliably, and is best used with an H2 buffer. And they are in stock as of this post. Caliber: 300 BlackoutBarrel Length: 7" Barrel Material: 11595E Spec Steel Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267) Bore & Chamber: Chrome Lined Weight: 2.2 lbs Twist Rate: 1:7 Gas System: Pistol Muzzle Device: 762/300BLK Flash Hider Muzzle Threads: 5/8x24 Handguard: KMR-A5 https://bravocompanyusa.com/bcm-standard-7-300-blackout-upper-receiver-group-w-kmr-a5-handguard/ https://www.ar15.com/media/mediaFiles/668/STCK5433-2__52241_1619790034-2029964.jpg https://www.ar15.com/media/mediaFiles/668/STCK5441-8__42631_1619790034-2029965.jpg Thanks a lot you just cost me some more money...  |
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Posted: 8/7/2021 6:07:41 PM EDT
[#20]
Quote HistoryQuoted: Thanks a lot you just cost me some more money... Yea, I understand. Buying PMAGS, Lancer mags, and who knows what else.... I guess I might need some ammo too. |
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Posted: 8/7/2021 6:17:34 PM EDT
[#21]
Quote HistoryQuoted: Yea, I understand. Buying PMAGS, Lancer mags, and who knows what else.... I guess I might need some ammo too. and a 9" stripped barrel came from BCM today just packed it up to trade in on the upper...  |
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Posted: 8/7/2021 6:54:14 PM EDT
[#22]
Danm! I thought my 7.5".300blk was short! 5" or less seems pretty crazy lol.
anyways, nice builds! i love super short little .300 blks! built mine on anderson receivers with a bca barrel and old MI SS rail i had laying around. under $500 build and its a hoot to shoot! just running fixed irons as its a truck gun/ something that i dont want to have to worry about batteries or optics. |
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Posted: 8/8/2021 8:47:29 AM EDT
[#23]
That is not ultra short, this is ultra short.
3.75 inch total barrel length   3.75 inch 300blk first test fire  3.75 inch 300blk  3.75 inch 300blk unsuppressed |
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Posted: 8/8/2021 10:29:12 AM EDT
[#24]
Noice...very noice.
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Posted: 8/8/2021 1:13:31 PM EDT
[#25]
Thats ridiculous!
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Posted: 8/8/2021 2:18:02 PM EDT
[#26]
Quote HistoryQuoted: BCM has released this one. 7" upper, multiple rail choices. I have one in hand now, I have not had a chance to test it yet. I have been told it runs reliably, and is best used with an H2 buffer. And they are in stock as of this post. Caliber: 300 BlackoutBarrel Length: 7" Barrel Material: 11595E Spec Steel Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267) Bore & Chamber: Chrome Lined Weight: 2.2 lbs Twist Rate: 1:7 Gas System: Pistol Muzzle Device: 762/300BLK Flash Hider Muzzle Threads: 5/8x24 Handguard: KMR-A5 https://bravocompanyusa.com/bcm-standard-7-300-blackout-upper-receiver-group-w-kmr-a5-handguard/ https://www.ar15.com/media/mediaFiles/668/STCK5433-2__52241_1619790034-2029964.jpg https://www.ar15.com/media/mediaFiles/668/STCK5441-8__42631_1619790034-2029965.jpg Wish they went 1:5 Seems people just aren't aware of rotational energy yet? If you're shooting subs, weight will be in the 200-220gr range and your velocity is capped, just say 1,000fps for easy math. A 1:7 will spin the bullet to 102,000RPM, but a 1:5 will be 144,000. If you're hunting or looking for max performance from a subsonic projectile, which one would you choose? |
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Posted: 8/8/2021 2:38:39 PM EDT
[#27]
Just messing around with stuff out of my parts box. On my BCM SBR lower.
  BCM complete upper with BCM BCG and charging handle BCM complete lower (Yes it is an SBR) CAR stock body on a milspec extension. BCM Keymod rail covers BCM forwar grip Midwest Industries front sight KAC 300 rear sight Sig Romeo 5 on a LaRue T1 mount IWC top rail mounted QD sling swivel IWC / Haley Throntail 6 light mount with a Surefire Scout Light IWC QD sling swivel end plate Lancer 300 Blackout 20 round magazine This thing is so short the forward grip is really needed. The thing is so short nothing can be on the sides of the handguard without interfering with your grip. So everything gets moved up. An inline light mount would do just as well. A shorter light would be okay, but the 600 fits without running off the front of the rail. I'm still messing about with parts. We'll see how it ends up. |
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Posted: 8/8/2021 2:59:23 PM EDT
[#28]
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Posted: 8/8/2021 3:18:56 PM EDT
[#29]
My 6" 300 blk & 8" 5.56
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Posted: 8/9/2021 1:51:06 PM EDT
[#30]
Quote HistoryQuoted: Wish they went 1:5 This is my main gripe with the kak baby blonde im currently borrowing from my room mate. It's short enough, give it the twist it deserves. On that note, kak has some weird twists on their barrels. I think they have an 8 or 9" 1:8. Im sure there are some people out there who only shoot super light supers, but that market has got to be so small |
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Posted: 8/9/2021 6:29:26 PM EDT
[#31]
Quote HistoryQuoted: This is my main gripe with the kak baby blonde im currently borrowing from my room mate. It's short enough, give it the twist it deserves. On that note, kak has some weird twists on their barrels. I think they have an 8 or 9" 1:8. Im sure there are some people out there who only shoot super light supers, but that market has got to be so small  Of my five .300blk barrels, three of them are 1-8 twists...including my shortest which is a 7.5" barrel. The other two barrels are 1-7 twist. I don't shoot a lot of subs. |
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Posted: 8/12/2021 2:35:49 PM EDT
[#32]
Quote HistoryQuoted: Yea, I understand. Buying PMAGS, Lancer mags, and who knows what else.... I guess I might need some ammo too. Got mine yesterday...like you said...PMags,Lancers,Ammo...$$$  |
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Posted: 8/30/2021 10:48:46 AM EDT
[#33]
Quote HistoryQuoted: Here is my 5” SLR. I enjoy it. https://www.ar15.com/media/mediaFiles/342261/0DCF2957-77A4-4F1A-86D2-0974CF07666B_jpe-2045104.JPG Looks great!
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Posted: 9/11/2021 3:16:29 PM EDT
[#34]
For 6”, what is the ideal twist? I’m guessing 1/5 but I can’t find anyone that makes that (albeit I haven’t been looking super hard).
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Posted: 9/11/2021 9:36:59 PM EDT
[#35]
I've got a 7.5" BCA .300 blk barrel with a 1/8 twist. its crazy accurate for what it is, way moreso than i ever expected from it. I only shoot supers. just running it with irons and a 20 rounder. its my truck/ camping gun. on a pistol lower with kak brace.
if you want a short ar pattern gun, .300 blk hands down is the best choice. I also have a 10.5" 5.56 upper and thats about as short as i want to go with 5.56, from there down .300 blk really shines. and i really resisted 300blk for a long time because i didnt want 2 types of rifle ammo. but, when it comes down to it, I dont shoot the 300 nearly as much as 5.56. |
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Posted: 9/12/2021 8:04:17 PM EDT
[#36]
Quote HistoryQuoted: I've got a 7.5" BCA .300 blk barrel with a 1/8 twist. its crazy accurate for what it is, way moreso than i ever expected from it. I only shoot supers. just running it with irons and a 20 rounder. its my truck/ camping gun. on a pistol lower with kak brace. if you want a short ar pattern gun, .300 blk hands down is the best choice. I also have a 10.5" 5.56 upper and thats about as short as i want to go with 5.56, from there down .300 blk really shines. and i really resisted 300blk for a long time because i didnt want 2 types of rifle ammo. but, when it comes down to it, I dont shoot the 300 nearly as much as 5.56. Have you ever tried shooting subs, even one box? |
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Posted: 9/16/2021 11:08:56 AM EDT
[#37]
I just built a 5-inch 1:5 twist 300 BO upper. After dealing with it being under gassed it is running pretty good for me. Just started using it so I have not stretched it out too much yet but it shot good at 25 yards using both my plinking and hunting subsonic ammo. I might have to work up a new load as I suspect these are probably only going about 850 fps since this ammo was originally loaded to go ~1050 from a 16-inch barrel. Definitely louder than my 9 or 16 inch barrels but still quiet enough to comfortably shoot it without hearing protection using my old SDN-6.
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Posted: 10/15/2021 4:23:15 PM EDT
[#38]
Quoted: Have you ever tried shooting subs, even one box? No, I dont see the need for it. subs are ususally more expensive than supers, and it doesn't make sense to me to spend more money on less powerful ammo. IF i had a suppressor, i would def try some out, but since i dont, I really dont see the point. Why do you ask? |
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