CORALREEFER

Starting a new build this wknd and have an idea of my base platform but also lots of new ideas. Over the years I have kind of stuck with what works for me; Anderson products, BCM bolt carriers, a variety of triggers, etc! I want this new build to be the best all around AR platform I can come up with. I am starting out with this Spikes Tactical lower and other than that, the sky is the limit. I am positive that I want to do a barrel in the length of 13-14.5 in. I want it to be a 300yd and in gun. Am strongly considering Daniel Defense for upper and barrel but am open to any and all ideas. One thing to note is at sometime I might throw a binary trigger in it to have some stupid fun, so I need something that will handle abuse. I have a stamp for suppressor and am wondering if I need to go with an adjustable gas block with that length of barrel, mainly because it may be suppressed one day and not the next.

I have never had a problem with any of my guns cycling suppressed. Although I do see my SBR's smoking heavily from the back of the barrel. So, please through out your ideas! There is really no budget on this, but I am not stupid either. I will prob do another thread on optics, so not that worried about furniture at this point.

irishhunter

yes to adjustable gas block , Red RTV mod the changing handle to keep the gas out of your face ......

Tireless

I can shoot my DDM4 with and without a suppressor and I don't use an adj gas block

irishhunter

I guess it depends we we hunt hogs we go up in bullet weight vs normal weight ....its nice to have it on there an its not a big $$$ add on or if you want to go to the lower end of 300 BO sub sonic you will need it

crazycarl7

Ive built a couple. Went with V7 upper receiver and handguard, faxon barrel to your length/caliber, cryptic coating BCG, and adjustable GB. I shoot both suppressed and not suppressed. It’s nice to adjust it to run perfect. Can’t remember my trigger group. Will check and reply

CORALREEFER

Thanks, I def plan on running some 300BO subsonic through it!

BraxII

I used an ARperformance barrel, an adjustable gas block and a hyperfire trigger on my 6.8 build. Very happy with the way it turned out. If you also buy the bolt from ARperformance, he well also check the head space for you.

willie g

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CORALREEFER

It all has to do with what stock is on it and if the ATF views it as a rifle stock or a pistol brace. It is a very crazy and stupid law.

willie g

so because it is called a "sig brace", its considered a pistol?

the guy said an SBR has to have a fixed stock, I don't believe that to be the case at all and honestly aside from the butt on that gun looks skinnier it looks like the stocks on my sbr's

k9medic

A 14.5" for a 300 yard rifle on an AR platform? What MOA are you expecting to get with that barrel? 10?

In my personal (and professional) experience, a barrel that short is only good for 100 yards with a solid <1.5 MOA .

Don't get me wrong, it will be a fun little gun but definitely not a 300 yard one.

Shag

Sig brace is actually a brand of "brace" that the ATF has determined doesn't turn it into a SBR. That particular one looks like a Shockwave. As stated above, stupid law.

tmd11111

Barrel length effects velocity not accuracy.

mwgoldman

huh? 10 MOA, you're doing something wrong. if its 1.5 Moa then its gonna be 1.5 Moa at 100 yards or 500yards. It doesn't change with distance.

Im a little confused if this is a 300 bo or a 556. But, I've never had issues getting MOA in the ar platform with barrels as short as 8 inches. its a only wives tale that longer barrels are more accurate.

bakerjw

The law states that a rifle must have a barrel 16" or longer. Overall length also comes into play. The ATF ruled that braces up to a certain length did not make an AR pistol a short barreled rifle i.e. an SBR. They really stepped in it with that ruling which is now coming back to haunt them with the likes of a Honey Badger.

The intended purpose of the brace is not for shoulder mounted operation; however, every one that I've seen in use has been shoulder mounted.

As SBRs as defined are codified in federal law the ATF ruling can be switched very easily and I suspect that they will rule that braces do make them SBRs. With the current climate in a certain big city with a lot of monuments, I suspect that it will occur very soon into next year.

k9medic

In a broad brush stroke, you are correct. Length effects velocity ergo rotational stability (in exponential gains) lead to a flatter shooting projectile.


mwgoldman 10 MOA was in jest. Obviously a 1 MOA rifle at 300 yards will in theory have a 3" spread.

Money where my mouth is - Top rifle is a .300 in 20" with a 1/8 twist. Bottom two are .223/5.56 in 16" with a 1/9 twist. Awaiting my new optic for the bottom rifle.

CORALREEFER

You summed it up very well!

cbrantley531

Also look into Odin products. They have some fine parts that a very reasonably priced.

Tireless

I believe there is a relationship between velocity and accuracy, especially at long distances