What AR15 barrel length is the most relevant.

Selected a barrel length based on the question in the OP.

  • 10.5" - 11.5"

    Votes: 36 9.3%

  • 14.5"

    Votes: 123 31.8%

  • 16"

    Votes: 164 42.4%

  • 20"

    Votes: 64 16.5%
  • Total voters
    387
That said,

My point still stands.

There are far more 20 inch (ish) barrels in service than there are shorter or longer.

And if you want a compromise between the long 24" and the short 16", then split the difference and use 20".

Or, buy one of each and swap the uppers around as required.

Yes, the new procurement pattern tends to be shorter barrels, but in terms of the original question posed, I think he's best off with a 20", if he can only afford 1 upper.

NS
 
Shelldrake is right.I should have been thinking about the optic and ammo making the difference.Its a good point.Still its a little hard to ignore the long barrels and brakes.Might be time to do some experimentation with a braked 20 incher,handloads and a Leupold Mark 4 6.5-20 with a TMR.I have a box of Nosler match hpbt 69 grainers that should do the job.
What brass is everyone using anyways?My guess is that for SR it doesn't have to be match brass?
 
I suppose I should get the tape measure out fellas...but I could have sworn that my chit house stock Bushmaster has a 17" barrel.

I would really, really like to try one of the shorties in 223 because some folks have told me they are rude to shoot. I can't imagine the little round being that rude...
 
KevinB said:
RCMP and FBI testing have shown that with proper ammuntion 5.56mm is much less likley to over penetrate than common handgun ammuntion.

I take it you don't have much of a background in ballistics testing.
Click to expand...

proof of said testing?

I find it hard to believe
 
Do a google or youtube search - there was a video by US Naval Surface Warfare Research or something ( just off my mind) that showed everything. THey built a shack with concrete masonry and dry wall - and then shoot it from 9mm to 50BMG (all the common small arms in the inventory)

It might have been posted here at CGN at one point as well.
 
greentips said:
Do a google or youtube search - there was a video by US Naval Surface Warfare Research or something ( just off my mind) that showed everything. THey built a shack with concrete masonry and dry wall - and then shoot it from 9mm to 50BMG (all the common small arms in the inventory)

It might have been posted here at CGN at one point as well.
Click to expand...

I've seen that years ago, reminds you that cover and concealment are different critters.
 
Power Pill said:
you don't think a .223 will shoot through standard dry wall?
Click to expand...

What type of ammunition is being used? There is .223 ammo out there that would not be a significant danger to someone behind drywall. You can buy it commercially. Once a round fragments, it won't be penetrating much.

Warning - there are a few rodents getting hit in the video, so don't click if you're squeamish.

http://www.youtube.com/watch?v=sYigC49tnh8

Try that with a 9mm.

Reliable expansion/fragmentation is MUCH easier to achieve at rifle velocities that it is at pistol velocities. A round that is properly selected for the task at hand will give far more reliable performance than a pistol caliber.

Once again, you are the person trying to disprove conventional wisdom. The onus is on you to provide some evidence other than your preconceptions, sir.

Edit: Gotsig, you beat me to it - good find on the comparative test. Also, no rodents were harmed in the making of your evidence :)
 
:p Though I don't find my reply worthy of a vote, :) the most relevant AR barrel length would be a really short one. :D Then you could wear a short trench coat with it.

<tongue in cheek>

:ninja:
 
Some random thoughts with respect to service rifle target shooting.
One very competitive shooter uses "Mexican Match" ammunition. Military ball rounds, 62gr. bullet pulled, powder dumped, powder remeasured one grain less, 69gr Sierra seated.
A brake is very beneficial in rapids or any matches requiring two shots per exposure.
Is the velocity difference 20" vs 24" significant? Balance of the rifle might be more important. A bit more velocity might help with wind at 500m. Easy enough to check with a ballistics program. 20" vs 24" is nt going to affect grouping capability.
As a matter of curiosity, I plan on shooting some test groups with 62gr ball side by side with the 68/69gr. handloads I usually shoot. It will be interesting to see what the difference is.
I am using Winchester brass, primarily because I have a good supply, have never done any comparison testing.
For competition, there are any number of sights that might be preferable to the Elcan.
 
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