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Posted: 4/4/2020 3:26:15 PM EDT
[#1]
Done a lot, but not very efficient - you can get comparable ballistics with 300BO or 7.62x39. Gets everyone’s attention though
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Posted: 4/4/2020 3:31:59 PM EDT
[#2]
I've got a CMMG MK3 12.5" 308 SBR. Runs great, but loud is an understatement. I had 31db ear plugs and 26db muffs on and it still managed to ring my ears a little with the factory muzzle brake. I've swapped that out for a dead air keymo brake and their pyro muzzle device which you can put into a mode that will direct gasses and noise forward. Eventually a DA Nomad will go on there when I get my permission slip. Unless you are suppressing it or like hearing loss, I wouldn't recommend going shorter than 16".
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Posted: 4/4/2020 4:04:01 PM EDT
[#3]
LMT MWSE w/13”+can: it’ll rattle your teeth.
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Posted: 4/4/2020 4:45:29 PM EDT
[#4]
Quote HistoryQuoted: I've got a CMMG MK3 12.5" 308 SBR. Runs great, but loud is an understatement. I had 31db ear plugs and 26db muffs on and it still managed to ring my ears a little with the factory muzzle brake. I've swapped that out for a dead air keymo brake and their pyro muzzle device which you can put into a mode that will direct gasses and noise forward. Eventually a DA Nomad will go on there when I get my permission slip. Unless you are suppressing it or like hearing loss, I wouldn't recommend going shorter than 16". Quote HistoryQuoted: I've got a CMMG MK3 12.5" 308 SBR. Runs great, but loud is an understatement. I had 31db ear plugs and 26db muffs on and it still managed to ring my ears a little with the factory muzzle brake. I've swapped that out for a dead air keymo brake and their pyro muzzle device which you can put into a mode that will direct gasses and noise forward. Eventually a DA Nomad will go on there when I get my permission slip. Unless you are suppressing it or like hearing loss, I wouldn't recommend going shorter than 16". Quoted: Done a lot, but not very efficient - you can get comparable ballistics with 300BO or 7.62x39. Gets everyone’s attention though Thanks, guess that pretty much solidified my wanting a can from the beginning...  .On a second note, not that I am that careless but no 300BO for me, it is identified easy but with 5.56 hanging around my house be my luck I take a friend shooting and he picks up the wrong mag and BOOM. I don't care how much you tell someone that doesn't work they still try to put the square peg in the round hole.  . I would will try to stay with .308 just because I already stock it (5.56 already has it's fun twin). It would be a range toy mainly but could be used for a serious HD threat inbound (better be really bad ). All my other calipers would be wasted for an SBR (they all have better ballistics but not as much power up close).
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Posted: 4/4/2020 5:40:58 PM EDT
[#5]
I absolutely love my 13.5" 308 SBR. It shoots accurate, reliably, and occasionally punches through old steel plates. Unsuppressed, it shoots flat and strong. Suppressed, it's not very quiet, but is manageable. I actually like shooting it more than both my 300BO and 556 SBRs.
To each their own. |
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Posted: 4/4/2020 5:45:51 PM EDT
[#6]
I was going to SBR my 308 but went the pistol route. Try that first OP, and see how you like it. 12.5" with a can is fun IMO.
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Posted: 4/4/2020 6:35:43 PM EDT
[#7]
12" Aero build.
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Posted: 4/4/2020 6:41:26 PM EDT
[#8]
Make sure to look into barrel length restrictions on your 308 can or if you don't have one take that into account when shopping for one.
Quoted: Done a lot, but not very efficient - you can get comparable ballistics with 300BO or 7.62x39. Gets everyone’s attention though Do you have some ballistic charts that show 300BO or 7.62x39 keeping up with 308 that I could check out? |
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Posted: 4/4/2020 6:42:48 PM EDT
[#9]
I just did a 12.5 sbr in 308 and love it. Alittle expensive to shoot, but reloading helps.
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Posted: 4/4/2020 9:08:04 PM EDT
[#10]
Quote HistoryQuoted: I was going to SBR my 308 but went the pistol route. Try that first OP, and see how you like it. 12.5" with a can is fun IMO. https://www.AR15.Com/media/mediaFiles/337946/20180823_203440-649068.jpg I have a few pistol grips. It will run that way until the form one gets approved. I will buy an upper and will get one of my 80% lowers engraved. Between the gun panic and the lock down not sure if the upper or approved eForm 1 will get to me first. 
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Posted: 4/5/2020 9:29:26 PM EDT
[#11]
It'll darn sure get peoples' attention...
 12.5" PSA build. |
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Posted: 4/6/2020 9:46:18 AM EDT
[#12]
I formed 1 a DSA 8" SA58, it's a real pig.
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Posted: 4/6/2020 10:46:40 AM EDT
[#13]
Quoted: I formed 1 a DSA 8" SA58, it's a real pig. Knew a guy with the factory shorty machine gun OSW I think. He said it was a monster
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Posted: 4/6/2020 2:01:21 PM EDT
[#14]
Originally Posted By StealthyBlagga: Done a lot, but not very efficient - you can get comparable ballistics with 300BO or 7.62x39. Gets everyone's attention though Lol. This again? A 12" 308 is either slinging same-weight projectiles hundreds of fps faster than a 16" x39 (2700fps vs 2350fps 125gr) or much heavier bullets at about the same velocity for much higher energy and better ballistics. |
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Posted: 4/6/2020 3:06:51 PM EDT
[#15]
Quote HistoryQuoted:
It'll darn sure get peoples' attention... https://www.ar15.com/media/mediaFiles/472753/05831AEA-7CBD-4BE0-96E3-CCEBD6A2F01C-1069720.png 12.5" PSA build. 
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Posted: 4/11/2020 10:04:31 PM EDT
[#16]
PTR makes an 8.5" pdw pistol if you're interested, love mine.
 
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Posted: 4/11/2020 10:54:32 PM EDT
[#17]
Quoted: PTR makes an 8.5" pdw pistol if you're interested, love mine. https://www.AR15.Com/media/mediaFiles/177719/20170424-212944-194742.jpg I almost bought one when I sold my 91K but think I want a 12" barrel. It will be a while before I get one but it will probably happen since I still have my pile of mags. |
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Posted: 4/25/2020 2:46:04 PM EDT
[#18]
Just ordered Noveske’s Leonidas. Shooting it unsuppressed in 308 would be kinda fun. But using it as a platform for a 8.6 Creedmore 12.5” switchblock barrel swap and putting a 338 can on it will inevitably be its final form.
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Posted: 4/25/2020 4:42:38 PM EDT
[#19]
Quoted: Just ordered Noveske’s Leonidas. Shooting it unsuppressed in 308 would be kinda fun. But using it as a platform for a 8.6 Creedmore 12.5” switchblock barrel swap and putting a 338 can on it will inevitably be its final form. Has Noveske said they're getting into the 8.6 Creedmoor game? |
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Posted: 4/25/2020 4:47:11 PM EDT
[#20]
16" is about as low as I want to go on a .308. The concussion level exponentially increases to past the point of being fucking obnoxious to the shooter themselves the shorter you go. YMMV.
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Posted: 4/25/2020 5:12:47 PM EDT
[#21]
Quote HistoryQuoted: 16" is about as low as I want to go on a .308. The concussion level exponentially increases to past the point of being fucking obnoxious to the shooter themselves the shorter you go. YMMV. If you handload for a closed breech gun you can efficiently take advantage of shorter barrels in .308. But even those tunings are never optimal for the cartridge. Generally I won’t go below 16” for .308, below 11.5” for 5.56, below 12” for 6.8 or 6.5 Grendel, below 20” for 6.5CM, below 8” for 300 Blackout, and for shorter barrels 9mm and FN5.7 hit the sweet spot for subsonics and supers around 5” barrels. 357 Sig would probably make a good PDW cartridge in the 6-8” barrel length. You almost always do better ballistically and for the shooter with a longer barrel and shorter suppressor, than a short barrel and longer suppressor. It’s best to let the powder do its work in the barrel than blow flash in the suppressor or out in the air. Assuming the point is exterior and terminal ballistics and not pyrotechnic masturbation. |
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Posted: 4/25/2020 7:32:33 PM EDT
[#22]
Quote HistoryQuoted: Has Noveske said they're getting into the 8.6 Creedmoor game? Not officially to my knowledge, but I’m confident they will. They’re shipping Leonidas’ with cherry bombs. They’re using the same collapsible stocks as Brittingham is on the HB. Kevin is always talking about what a great company they are and if any of his clientele want a black HB, he tells them to buy a Noveske Ghetto Blaster. They have a close relationship. I’m confident enough to put money on it, as yesterday I purchased a Leonidas to get me through the NFA process... Noveske will be playing the 8.6 ball within a year. |
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Posted: 4/28/2020 5:51:29 AM EDT
[#23]
Quote HistoryQuoted: Damn, burned your shirt right off! Quote HistoryQuoted: Quoted: It'll darn sure get peoples' attention... https://www.ar15.com/media/mediaFiles/472753/05831AEA-7CBD-4BE0-96E3-CCEBD6A2F01C-1069720.png 12.5" PSA build. Damn, burned your shirt right off! Not I. That's my 18yo kid. He thought shooting while shirtless was a great idea until he encountered a hot .308 case. Ain't like I didn't warn him... 
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Posted: 4/28/2020 10:09:09 AM EDT
[#24]
I’m waiting on my stamp to come in for my 13” DSA OSW factory SBR. I bought a Rugged Razor at the same time for it.
I’m gonna vote to do it. Practicality be damned. |
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Posted: 4/28/2020 10:27:25 AM EDT
[#25]
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Posted: 5/3/2020 10:46:29 PM EDT
[#26]
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Posted: 5/3/2020 10:55:24 PM EDT
[#27]
Quote HistoryQuoted: Lol. This again? A 12" 308 is either slinging same-weight projectiles hundreds of fps faster than a 16" x39 (2700fps vs 2350fps 125gr) or much heavier bullets at about the same velocity for much higher energy and better ballistics. |
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Posted: 5/3/2020 11:15:20 PM EDT
[#28]
Quote HistoryOriginally Posted By Furyataurus: PTR makes an 8.5" pdw pistol if you're interested, love mine. https://www.AR15.Com/media/mediaFiles/177719/20170424-212944-194742.jpg I just got my 91 GIR, and the discovered the K version pistol. Kinda of want. |
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Posted: 5/5/2020 7:09:32 PM EDT
[#29]
The 11.8" barrel 7.62 nato galil ace pistol is perfect for SBRing.
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Posted: 5/8/2020 3:41:45 PM EDT
[#30]
I have a Sig 716 12.5 SBR, an FN (Imbel) FAL para in 13", a CMT 308 AR in 10.5. The 716 is bearable, but heavy. The FN is just a delight to carry. The CMT is way lighter than the SIG, but the muzzle blast is obnoxious. I was going to SBR my SCAR-H, but I kinda nixed that idea due to the price of the barrel. I guess if I ever did another one, it would be on the PTR K3P 12".
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Posted: 5/8/2020 10:22:02 PM EDT
[#31]
You could opt for a Tavor 7 or another bullpup 7.62x51 rifle. Just as short as most SBRs, but you get to keep decent ballistics with the 16.5" barrel.
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Posted: 5/24/2020 11:29:28 PM EDT
[#32]
Quote HistoryQuoted: Unless you are suppressing it or like hearing loss, I wouldn't recommend going shorter than 16". Bingo. These people shooting the .308 shorties with only foam ear plugs are absolutely loosing hearing -permanently. Sad that they just won't realize it until far too late. Short 5.56 is not as brutal, but definitely will do the damage too. |
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Posted: 5/26/2020 8:08:29 PM EDT
[#33]
Here's an interesting comparison of a 308 shorty to a 7.62x39 AK on InRange
 7.62x39 vs 7.62x51 |
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Posted: 5/26/2020 9:08:32 PM EDT
[#34]
Quote HistoryQuoted: Here's an interesting comparison of a 308 shorty to a 7.62x39 AK on InRange  https://www.youtube.com/watch?v=U2dtJsXLIOI.308 147gr 16" - 2670 fps/ 2327ft-lbs 8" 1945 fps/ 1235ft-lbs 7.62x39 123gr 16" 2460fps/ 1653ft-lbs 8.5" 2099fps /1203ft-lbs In other words, 8" is about where they meet in terms of muzzle energy with those respective loads. I wonder how fast a 125gr bullet would be going out of an 8" 308. I can't find any data on that. It seems like it would be going somewhere in the middle of the 16" and 8" x39. If it ended up being something like 2200fps, then that would mean an 8" 308 shooting 125gr is about the same as a 12" x39, so you'd have to go a lot shorter on both until their respective muzzle energies met. Either way, an 11.5-12.5" 308 is still significantly more powerful than a x39 in any barrel length. |
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Posted: 6/22/2020 6:30:01 PM EDT
[#35]
Quote HistoryQuoted: I almost bought one when I sold my 91K but think I want a 12" barrel. It will be a while before I get one but it will probably happen since I still have my pile of mags. 12" version 
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Posted: 6/22/2020 6:33:17 PM EDT
[#36]
Quote HistoryQuote HistoryQuoted: Quoted: I almost bought one when I sold my 91K but think I want a 12" barrel. It will be a while before I get one but it will probably happen since I still have my pile of mags. 12" version https://www.AR15.Com/media/mediaFiles/18486/IMG_5600_JPG-1459248.jpg My man. Don’t think I could do that stock but otherwise that looks awesome. |
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Posted: 6/22/2020 7:01:55 PM EDT
[#37]
Trijicon Credo HX 1-6X24 and Scalarworks mount will be here Wednesday,
 
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Posted: 6/22/2020 7:03:54 PM EDT
[#38]
Boom boom, love you long time!
I have a 12.5 with a can. "Effective"? No. Fun, hell yeah! Even with no can, a fun party favor! |
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Posted: 6/22/2020 7:04:26 PM EDT
[#39]
Tavor 7 for more compact and better practicality, unless you just want a big loud fireball, haha
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Posted: 6/22/2020 7:17:38 PM EDT
[#40]
Quote HistoryQuoted: My man. Don’t think I could do that stock but otherwise that looks awesome. Thanks. If I didn't need it to fit in small spaces I would have a 21E clubfoot on it probably. |
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Posted: 6/22/2020 10:12:00 PM EDT
[#41]
Quote HistoryQuoted: Thanks. If I didn't need it to fit in small spaces I would have a 21E clubfoot on it probably. Quote HistoryQuoted: Quoted: My man. Don’t think I could do that stock but otherwise that looks awesome. Thanks. If I didn't need it to fit in small spaces I would have a 21E clubfoot on it probably. I actually like the normal fixed stocks. I had a PTR 91K with the folder but the LOP was stupid long. I am over 6' and still couldn't easily throw it up. I don't know if the MP5K stocks are shorter but they look like it. I always wondered if they could fit on the 308's. |
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Posted: 6/22/2020 10:22:05 PM EDT
[#42]
Quote HistoryQuoted: I actually like the normal fixed stocks. I had a PTR 91K with the folder but the LOP was stupid long. I am over 6' and still couldn't easily throw it up. I don't know if the MP5K stocks are shorter but they look like it. I always wondered if they could fit on the 308's. You may want to look at the Spuhr stock. The Swedes have them, and they're supposed to be awesome. You can't really use irons with them anymore (they take the rear sights off and cut the front tower down) but they run Aimpoints or mag optics on them.  The A3 stock on the G3K is actually the same stock as the A3 for the G3. The LOP is the same length. I'm over 6' and they are long for me too. Here's a pick with the A3 next to an A2 on my G3 clone, and then folder PDW stock on my MP5K clone, which is shorter. 
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Posted: 6/22/2020 11:23:33 PM EDT
[#43]
Quoted: You may want to look at the Spuhr stock. The Swedes have them, and they're supposed to be awesome. You can't really use irons with them anymore (they take the rear sights off and cut the front tower down) but they run Aimpoints or mag optics on them. https://www.AR15.Com/media/mediaFiles/18486/9015e3cb8367304ea0f17dc3a3d6c205--long-a-1472986.jpg The A3 stock on the G3K is actually the same stock as the A3 for the G3. The LOP is the same length. I'm over 6' and they are long for me too. Here's a pick with the A3 next to an A2 on my G3 clone, and then folder PDW stock on my MP5K clone, which is shorter. https://www.AR15.Com/media/mediaFiles/18486/IMG_5261_2_JPG-1472973.jpg I sold it. If I get another it will be a 12". Being that I have 100+ mags I will probably end up with one eventually. |
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Posted: 6/23/2020 6:01:19 PM EDT
[#44]
 Failed To Load Title I'd definitely give the Tavor 7 a look. I've got a 12.5" CMMG .308 and this, and I prefer the Tavor 7 now. I've got a dead air flash hider on there for general shooting which is pleasant, but I can throw on the dead air pyro like in the video if I ever want stupidly big fireballs. It's the best of all worlds. 12.5" CMMG .308 with stock collapsed - 29" Tavor 7 16" barrel .308 - 26.1" |
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Posted: 6/24/2020 11:23:04 AM EDT
[#45]
I have a couple of short barrel 308 firearms and am a pretty big fan of the bigger caliber short barrel guns.
I have a HK51 with an ~8" barrel and a HK G3K, a FAL SA58 converted to a DSA OSW, and an "AR" variant Colt LE901 all of which have ~12" barrels. The sweet spot to me is about 12" in barrel length as any shorter and they become a giant flame thrower/concussion grenade (not saying thats necessarily a bad thing but understand that not everybody's cup of tea)G3K  SA58/FAL OSW  Colt LE901  Good luck with your decision/build. |
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Posted: 6/25/2020 11:23:23 PM EDT
[#46]
I have failed miserably keeping up with this thread...
I see CMMG mentioned and will probably get an upper from them but any other suggestions on a complete upper? |
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Posted: 6/26/2020 11:07:03 AM EDT
[#47]
I had a ptr G3K clone until a buddy liked it so much he bought it from me. Don't let anyone scare you, it's not nearly as loud or painful to shoot as the internet makes it out to be. I even had the A3 stock on it. Very nice to shoot IMO and I'll definitely pickup another to replace it.
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Posted: 6/27/2020 11:57:34 PM EDT
[#48]
Brother has a 12.5 pof.... do not shoot it indoors.... trust me
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Posted: 6/29/2020 8:57:59 PM EDT
[#49]
I've got a G3K. It's a fantastic gun, mines all German from TSC Machine. They modified an HK21E stock and buffer system which makes it a really sweet shooter.
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Posted: 6/29/2020 10:15:07 PM EDT
[#50]
This thread is relevant to my interests.
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