I know a lot of this has been gone over, I've read the threads as they came up because I was mildly interested, but now I'm really interested and may very well take the plunge.

Would like to get a 300 blackout SBR, with a can. I've googled and read a bunch online, but would like to hear what the 'campfire has to say. Looking for feedback from them that either have them, or are familiar with them.

Obviously this ain't going to be cheap, but price is certainly a consideration. Would like to hear recommendations on brands and bbl lengths. From what I've been reading it seems like a 9" upper might be the way to go? Thought about building one, but having not built one before and this being a finicky bastard according to some I figured I'd just buy a ready made upper.

Thank you

You gonna run sub and supersonic? That seems to be an issue for some. I wouldn't see the sense in going supersonic, but that's me.

Would like the ability to do both, but primarily sub.

Build it sub, run it sub.

When you want super, get a better super round.

Just my take on it.

Yup keep it sub and simple.

Good advice.

I wonder if you can set them up so that they will cycle subsonic with a suppressor and function fine without a suppressor and supersonic ammunition? Then the trouble is you need one of those Eocraps made for the BO with two dots in it.

scope with knobs takes care of anything....

Cycling and optics are secondary issues.

The first question you should be asking yourself is, what am I going to use this for?

That will dictate the specs of the rifle.

Why would anyone want to shoot the .300BO supersonic out of a 9" bbl?

Having answered that, form follows function.

I have a Noveske 10.5 upper that I leave my suppressor on. I shoot subs ad supers. Deer die both ways. My farm is in suburbia and noise reduction is pretty good with the suppressor on shooting supers. The rifle feeds , ejects, locks on last load regardless of the round, sub or super.

Use/have used several Noveske's, AAC's and a Honey Badger or two. They all run subs and supers without issue.

I am not sure why people act like supersonic ammo is a stupid idea in a 300 BO but it can only be from ignorance or misunderstanding. It's a system, and the ability to shoot subsonics and ammo with 300+ meter range by just switching mags is huge if you need subsonics. Subs are the niche, supers are the mainstay.

That makes sense, if somebody has a need to do both.

Is there really any need for the extra expense of a SBR now that the Sig brace is available?



Travis

Sometimes I wonder if people here live in a cave.

Sub and super, suppressed or not, is how the 300 BLK AR platform is meant to be set up. A gun that won't run under some of those conditions, with no changes, isn't set up "as designed".

To the OP - easy button is a 9" AAC upper. They do cost a bit more, but are very light weight and good quality, and since it was AAC that pioneered the standardization of the round and it's "dual purpose" nature, you know it'll be set up right.

BTW, the easy way to play while you wait for the SBR stamp is to build it as a pistol, then just add a stock when the stamp is approved. Like many others, you may decide the stock and SBR paperwork aren't necessary anyway. I left mine as a pistol, and run it with the buffer on my shoulder same as if it had a stock.

You could give me an AAC. But I'd just sell it.

Honestly.... No. While being able to change buttstocks is nice and I prefer the "feel", the Sig Brace (especially V2) is functionally the same. And it has the benefit of being legally a pistol... CCW etc.

Why would you build a SBR ($200 tax stamp) and use a can (another $200), when you can build a pistol with the can in the float tube and a Sig Arm Brace and only pay tax on the can?

http://www.sigsauer.com/CatalogProductDetails/p516-10-pistol-with-sb15-pistol-stabilizing-brace.aspx

One other thing about subsonics that I have noticed is if you want to hit things the size of beer cans, you gotta have your dope dialed in just about as well as you would your 22LR.

You can kiss that "hold on fur" schit good-bye.

Whatever that's worth.



Travis

The quietest version will be a bolt or break action gun. I threaded a 30-30 handy rifle and it shoots subsonics very well and is quiet.

Of course the AR is plenty fun. I have only shot this poor coyote with mine but the 220 subsonic does not impart the hydraulic shock like a 223 does.

I didn't say shooting supersonics out of the .300blk was stupid, I questioned a 9" bbl if one intends to shoot supersonics much.

The fact you think a .300blk has a 300 meter range with a 9" bbl is interesting. Most of us here live in the real world, not the faux tacticool world.

A supersonic .300blk round out of a 9" bbl is barely above subsonic at 300 yards. I realize you've probably never killed a large mammal with a subsonic in your life, but advocating a 125g bullet for use at or around subsonic velocity, at that range, is ignorant and foolish.

Thank you all for the input!

BTW I am hoping to bag an elk next year at a self imposed minimum range of 1,000 yards.

Yep. Launched subsonic even a long sleek 220 Matchking is about 4 inches low at 100, when zero'd at 50. I shot a doe with it, and last saw the doe about 200 yards away, running over a hill - on another ranch. I believe I hit her too high. Decent blood trail, but the deer was lost. I believe it would have been a bang flop with a normal deer rifle.

I have heard good things about the Lehigh Defense bullets, and I also finally scored some 240 Matchkings. Carefully placed these might be better.

https://www.lehighdefense.com/shop/...m-expansion-194gr-subsonic-bullet-detail

You'd run headlong into a blinking neon sign, huh....


If I was to bet, I'd bet that a Barnes Blacktip 110gr TTSX does nice things in tissue well past 300m from a 9in barrel, and is also bet that those would upset at 300m from a 6in barrel as well.... May even penetrate barriers at that range.... Give or take.

LMAO

god you're stupid. A reject off arfcom.

Not so sure about the 110 TTSX. But I have shot deer with a 125gr Ballistic tip, launched at mild speeds (~2200fps) from a Contender, and it expanded well, and killed quickly. That's about how fast they can run out of a Blackout.

For anyone new to the .300 I'd suggest that they load to mag length ~2.24", rather than the 2.08" generally published, as I have found better accuracy in two different AR's, and they functioned fine. That's with plastic tipped or other pointy bullets. If the bullet has a blunt tip then shorter OAL may be needed to assure feeding.

In my opinion the 300BO just makes more sense out of a short barrel than 5.56 out of a short barrel, it makes about 2100 FPS with a 110 in a 9.5 inch pistol barrel. Making a 9.5 inch Sig brace 300BO pistol loses about 200 FPS IIRC from a 16 inch 300 BO rifle barrel and that right there is a pretty good trade.

Having actually shot a deer with a Sig brace BO pistol/110 barnes I can confirm the deer is reliably dead with a 25 cent sized hole thru both shoulders from 55 yards, please excuse me for stating facts if they differ from anyones suppositions.

I would have no use for the BO cartridge in a 16 inch barrel, nor would I have any use for a 308win or 6.8SPC in a short barrel.

The blacktip 110 grain Barnes Vor-TX is designed to expand down to 1300FPS, that is a fact and its a very good bullet, I would not try to hit anything past 200 with the pistol set up on the other hand the Sig brace pistol is pretty handy in a small ground blind. A suppresor to take the edge off of supersonic loads would interest me for hunting, I am looking into this for next year.

The 110 Vor-TX is a pretty good bullet.

https://www.youtube.com/watch?v=uDTvbzExaPI

You pay for the SBR $200 on your lower if you do as I do and have a herd of different caliber uppers you like to run short. I like the way they handle with a suppressor attached. Now, If I had to do it over, I would have bought a titanium can and eliminated about a pound hanging off the end of my barrel.

Ditto on the 110 barnes TAC-TX. I started shooting 300 whispers with a contender single shot pistol and carbine in 2001. The 125 gr Nosler was my super bullet and I killed a pile of deer with it. I started shooting the 110 barnes bullet two years ago. I like it even better.