SBR - How To Do It Legally?

[varmint]

Originally Posted by AZ_porschekid

The five seven will go through soft body armor... That's the appeal.

I don’t think they sell that version of the round to the public. Just law enforcement.

[Arizona_928]

Originally Posted by varmint

I don’t think they sell that version of the round to the public. Just law enforcement.

Like that stops any criminal. Lol
They're used in Mexico by the cartels.

[red-beard]

Originally Posted by AZ_porschekid

The five seven will go through soft body armor... That's the appeal.

Any rifle round will go through soft body armor. They are designed for pistol rounds.

[Arizona_928]

Originally Posted by red-beard

Any rifle round will go through soft body armor. They are designed for pistol rounds.

But we're not talking mini draco, or those ar pistols.
Fn five seven.

[red-beard]

Any thoughts on buying something like the Springfield SAINT or RUGER AR-556 pistol vs build yourself from a kit? I'm thinking of this from PSA:



https://palmettostatearmory.com/psa-10-5-5-56-nato-1-7-phosphate-classic-shockwave-pistol-kit-black-5165449130.html

I've assembled a lower before, so no real issue.

[Rick Lee]

I just bought that kit and built it two weeks ago. Works great. I already had a few stripped lowers laying around. I had it running in no time.

Edit: Mine has the Magpul handguards.

[red-beard]

I have a stripped lower in the safe that needs some love...

[Arizona_928]

I would go with a 14 inch barrel for all around ballistics.
The lower barrel size looks cool, but are extremely loud and essentially a door buster gun.

As always it comes down to practicality, vs fun. With that said if anyone needs a 7 inch barrel for the 223. I'll sell one cheap.

[red-beard]

11.5 Should be about 2900 ft/s.

http://www.ballisticsbytheinch.com/223rifle.html

[Arizona_928]

2900 is optimistic on normal ammo.

[red-beard]

Interesting. That is a good chart. It seems to me that the larger rounds, while moving slower, might be a better choice.

[Arizona_928]

It's a little bit more than that. 1:7 twist as in the link posted won't shoot lighter bullets with good results. The 1:7 is good for 55-69gr if using the chart. Which is the bulk/surplus ammo. m855 is 62 gr, 55 is the cheapy stuff that is always available, 64gr for tracer. The ballastics are predictable.
Compare those rounds with a short barrel .223/5.56 to the 7.62x39 through a short barrel akm. The velocities will be comparable, but the 7.62x39 has more energy.


That's why I say they're fun, but realistically a toy.