your thoughts on sbr caliber
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300blk. The caliber was designed to be short barrel friendly. It also will take very kindly to a suppressor if you decide on one later.
It really depends on the length of my build. If I'm going sub 9 inch then 300 would have the best performance. If I'm going 11.5 MAYBE 10.5 then 223 is adequate. Although 11.5 would be ideal.
I guess it depends, so you want a rifle that will perform well ballistics wise or just something fun to shoot?
Doesn't matter if you're set on a rifle caliber, just register the lower and you can swap uppers. You'd be good for a variety of calibers 300, 223, 6.8 etc.
It really depends on the length of my build. If I'm going sub 9 inch then 300 would have the best performance. If I'm going 11.5 MAYBE 10.5 then 223 is adequate. Although 11.5 would be ideal.
I guess it depends, so you want a rifle that will perform well ballistics wise or just something fun to shoot?
Doesn't matter if you're set on a rifle caliber, just register the lower and you can swap uppers. You'd be good for a variety of calibers 300, 223, 6.8 etc.
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11.5 offers the best ballistics/length compromise. You can find an article, on "why BCM chose the 11.5 for sbr.". Speaking of BCM, that would be my go to for an 11.5. If I was doing a 300 I'd probably go DD or Noveske assuming budget wasn't an issue.
But you can pick up a BCM complete upper 11.5 for around 500 with BCG. That's if you skip the handguard.
I'm building a "pistol" right now with those parts. Spikes punisher with red barn lpk and ALG trigger. CAC pistol buffer with SB15. With a BCM 11.5 upper. I'll likely pop off the A2 sight and throw on a vltor Casv and a noveske kx5. Would make a sweet little pistol.
But you can pick up a BCM complete upper 11.5 for around 500 with BCG. That's if you skip the handguard.
I'm building a "pistol" right now with those parts. Spikes punisher with red barn lpk and ALG trigger. CAC pistol buffer with SB15. With a BCM 11.5 upper. I'll likely pop off the A2 sight and throw on a vltor Casv and a noveske kx5. Would make a sweet little pistol.
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Study local, state and Federal laws... Look into a Gun Trust
There are a lot of good information on this site if you search it along with AR15.com. Do some google searches. I can tell you what is needed but unless you understand the scope of what you are getting into, it will not matter.
@John A. might be willing to help out. He is a wealth of NFA knowledge, but there is a lot the goes into owning NFA weapons
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Best is relative to what you want to do with it. With as little information you provided in the OP, there is no way to be able to give you a really good answer.
While it has been noted that the 300 blackout does do well in + 8" barrels, that is not to say that many other weapons (calibers) do poorly either.
Just for the record, pistol calibers like 9mm and 45acp, 38/357, 40 S&W 10mm, etc also will do well from an even shorter (than 8") barrel and were actually designed to be fired from barrels shorter than 6 inches and when fired through longer barrels actually exceed the usual manufacturers velocity and "power rating" and increase in velocity and ft pounds, etc.
As for suppression, 4 of the 6 handgun calibers I mentioned above all have subsonic loads for them. Actually, the 38 Special, are all subsonic, even the +P, though I don't know any AR that are chambered in 38357, but they could be with a few design changes, but I digress. There are however 9mm, 40 S&W, 10mm and 45acp AR's out there.
AAC/Remington has spent years trying to push the 300 blackout (which they didn't design and mostly pirated anyway but is a whole different topic altogether), but in their marketing push, they only mentioned the few calibers that the blackout does perform slightly better than.
Do you remember anyone from AAC comparing the blackout to 10mm or even 45acp for close quarters tests? I don't. And with reason.
True that supersonic blackout does perform better at longer ranges than a handgun caliber, but if you're going to be building an sbr, I can only assume that it's for shorter ranges where an SBR would be the obvious better choice. Sniping targets at longer ranges simply dictate different weapons and choices.
So, what are your expectations and purpose/reason for considering building an SBR? What do you want to do with it and what do you want it to do?
While it has been noted that the 300 blackout does do well in + 8" barrels, that is not to say that many other weapons (calibers) do poorly either.
Just for the record, pistol calibers like 9mm and 45acp, 38/357, 40 S&W 10mm, etc also will do well from an even shorter (than 8") barrel and were actually designed to be fired from barrels shorter than 6 inches and when fired through longer barrels actually exceed the usual manufacturers velocity and "power rating" and increase in velocity and ft pounds, etc.
As for suppression, 4 of the 6 handgun calibers I mentioned above all have subsonic loads for them. Actually, the 38 Special, are all subsonic, even the +P, though I don't know any AR that are chambered in 38357, but they could be with a few design changes, but I digress. There are however 9mm, 40 S&W, 10mm and 45acp AR's out there.
AAC/Remington has spent years trying to push the 300 blackout (which they didn't design and mostly pirated anyway but is a whole different topic altogether), but in their marketing push, they only mentioned the few calibers that the blackout does perform slightly better than.
Do you remember anyone from AAC comparing the blackout to 10mm or even 45acp for close quarters tests? I don't. And with reason.
True that supersonic blackout does perform better at longer ranges than a handgun caliber, but if you're going to be building an sbr, I can only assume that it's for shorter ranges where an SBR would be the obvious better choice. Sniping targets at longer ranges simply dictate different weapons and choices.
So, what are your expectations and purpose/reason for considering building an SBR? What do you want to do with it and what do you want it to do?
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Why hinder yourself with the AR platform for a pistol caliber gun at all? I'd get a Tommy Gun or Kriss if I wanted a 45 sbr.
I've gotta think a supersonic 300blk would trounce a 45 at close range with a decently designed bullet. It is only when subsonic that the 45 wins.
Ballistics by the inch
looks like out of an 9" barrel, the 45acp peaks at 700ft-lbs with the fastest +P
The 300blk supersonics are over 1100ft-lbs from the same length
300 AAC Blackout 7.62 35mm - Wikipedia the free encyclopedia
I've gotta think a supersonic 300blk would trounce a 45 at close range with a decently designed bullet. It is only when subsonic that the 45 wins.
Ballistics by the inch
looks like out of an 9" barrel, the 45acp peaks at 700ft-lbs with the fastest +P
The 300blk supersonics are over 1100ft-lbs from the same length
300 AAC Blackout 7.62 35mm - Wikipedia the free encyclopedia
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If that is a question for me, I don't own a 9mm AR.
I covered my pistol caliber bases with an sbr MP5K and I also have a f/a Ingram M10/9 that has a Lage upper and 8.5" barrel.
Both of which were originally designed to use 9mm.
Many Ingrams can use both 45acp and 9mm by simply replacing the mags and complete upper much like AR's.
I also have a full size semi auto uzi that I adore.
.I wouldn't bother with 300BLK unless you are (1) reloading, and (2) getting a suppressor. If you are doing both, 300BLK is an awesome round. If you're not doing either, it's very expensive and you aren't really getting the benefit of the design; in this case, I'd opt for 5.56 (for defensive use) or .22lr (for plinking). Can always build a 300BLK upper for your lower sometime down the road when you're ready to take full advantage of the caliber.
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