Best cartridge for a “Long Barreled Pistol” possible SBR

Second, you can't buy a new receiver as a handgun or a rifle (or anything else for that matter); it's simply a "receiver". A dealer doesn't get to put whatever he wants on the 4473 as far as the firearm type, and he can't base it on the buyer's future plans for the firearm build. No, the dealer has to sell the firearm as it actually is. A new receiver is simply a receiver. It can't be sold as a pistol or a rifle, even if the receiver has a stock on it. So if you're buying the receiver and the dealer puts anything other than "receiver" on the 4473, he's wrong and he somehow missed the open ATF letter from 2009:
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I don't know what my transfer dealer put in his book, but when I got a lower with a pre-installed pistol buffer transferred in two months ago, the dealer told me that because it's pistol it would be illegal if I ever put a long barrel on it. :rolleyes:

I decided to not even argue with that logic.
 
Legally, HOW in the hell do you prove what the first build configuration of a given reciever is? LOL Personally, I'm just going to take a dated picture and store it away. There ya' go.
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You can't. But they also can't prove it either way unless you bought it as a complete rifle.

Anyone can Photoshop a picture. Maybe a sworn and notarized affidavit?

It's not worth worrying about. You'd have to have done something really stupid to get the attention of an official concerned with that kind of scrutiny. If this ever comes up in court, the accused will likely have a list of other charges as a primary concern.
 
Best round? 10mm Auto.
Lots of punch. Can reach out to 100 yards with ease.
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This.

Absolutely - in an SBR chambered for a pistol cartridge, the 10mm AUTO wins hands-down, especially when loaded at full-throttle velocities.

There's a reason the FBI chose HK MP5 sub-guns chambered in 10mm rather than defaulting to the 9-minimeter. Better terminal ballistics, flatter shooting at distance, and the ability to fire much heavier bullets.

Although my preferred platform would be a 10mm AR in 9" or 10" SBR trim that would reliably run 15-rd G20 mags with Arredondo's +5 extensions (for 20-rds on tap), I did like the few HK MP-10s I've handled over the years.
 
Well, I ran across the following round today, Hornady’s 556 TAP SBR. The round was specifically produced to burn all of the powder in a 10.5” barrel. Hornady claims lower muzzle flash, 6-7 db reduction, increased accuracy and better terminal ballistics at lower velocity.

The only issue is trying to find the suckers, in stock, for a reasonable price. Some online retailers are reserving the rounds for law enforcement only and others are asking $20+/box of 20. I finally found a retailer selling them for $19/box of 20; they ended up being roughly $21/box after shipping. That’s high but not terrible for a performance self defense round. I’ll give them the run through after I have have everything assembled, hopefully next weekend.

http://www.policemag.com/channel/weapons/articles/2016/05/made-for-each-other.aspx


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An AR pattern 10mm, gas operated, would be my choice based on the title of the OP thread.

But that does take some effort and money to get there. Maybe in a few years, there will be more.

AR9s, Glock fed, and KelTec Sub2000s are great options. Accurate, quiet, anyone can shoot them well.

I played with short and long barreled .300BOs, and sold them all off. You can get better terminal performance with the 9mm than the .300BO. The 300BO has very few rounds that perform well for SD at sub-sonic velocities, and they are expensive as heck. The exoctic 9mm market is growing fast and I have been able to get over 2100 fps in my 9mm carbines as well as 160 grain solids at 1050 fps. The plinker ammo is cheaper too.
 
"You can get better terminal performance with the 9mm than the .300BO. The 300BO has very few rounds that perform well for SD at sub-sonic velocities, and they are expensive as heck."

I'm not a proponent for 300 blackout, I don't even own one. Your statement may be true when comparing subsonics only, but the advantage to 300 blackout is you can go supersonic with just a mag change. 300 blackout supersonic is a rifle caliber and blows 9mm away in terminal performance.
 
Yes, but supersonic 300BO rounds without a suppressor are MUCH more concussive than 9mm at supersonic.

Terminal performance, not as clear cut as you make it seem Overkill777. I have done a good bit of terminal performance evaluation with bonded 9mms pushed into the 1600 to 2100 fps range as well as the 110 and 125 300 BOs at 1700 to 2300 fps. When taking all things into account, there is not a whole lot of difference and some cases when the 9mm outperformed the 300BO and others where the 300BO outperformed the 9mm. There is enough in each to select the right bullet for the application.
 
This is going to be a fun weekend… :D

I don’t have the cash right now but I’d eventually like to pick up a nice chronograph and a DB level monitor. Right now, I can afford a scale and my feed back. :P

Here's to range day!!! :cool:

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