7” versus 10.5” velocity?

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[ARCHIVED THREAD] - 7” versus 10.5” velocity?

Posted: 2/27/2006 9:08:55 AM EDT

Does anyone have any info on 7” vs. 10.5” velocity?

I have been humming and hawing the idea of an AR pistol build or purchase for a while and I’ve pretty much decided to do it. I think I will be using my tax return for one.

Terminal performance is a consideration in case it is ever used defensively. I don’t even know if either barrel will have “good” performance but I’d like to get a handle on the differences.

Thanks guys.

ETA: I am talking about 223/5.56 in case that didn't go without saying.

ETA: My current understanding is that 55 grain should be going about 2200 fps from a 7" and about 2700 fps from a 10.5" but I don't have much to go off of. Just "what I've heard".

Posted: 2/27/2006 12:03:32 PM EDT

[#1]

You will likely get no fragmentation from either barrel, just a nice clean .22" hole. You will have to consider some type of expanding round if you want to use it for defense.

Posted: 2/27/2006 2:11:21 PM EDT

[#2]

both are going to suck, i went with the shorter

Posted: 2/27/2006 2:39:00 PM EDT

[#3]

7.5" , Baby!

It'll Toast a badguys Eyebrows at close range.

Posted: 2/27/2006 2:46:58 PM EDT

[#4]

More reliable? 10.5. More powerful? 10.5, and by a significant margin. More fun? 7.5 of course!

Decide accordingly.

Posted: 2/27/2006 3:09:12 PM EDT

[#5]

Quoted:
More reliable? 10.5. More powerful? 7.5, and by a significant margin. More fun? 7.5 of course!

Decide accordingly.

Wait a second, are you saying a 7.5" barrel with be more powerful? Like, more energy?

Posted: 2/27/2006 3:10:16 PM EDT

[#6]

Quoted:
Quoted:
More reliable? 10.5. More powerful? 7.5, and by a significant margin. More fun? 7.5 of course!

Decide accordingly.

Wait a second, are you saying a 7.5" barrel with be more powerful? Like, more energy?

Edited.

Posted: 2/27/2006 3:15:19 PM EDT

[#7]

Quoted:
Quoted:
Quoted:
More reliable? 10.5. More powerful? 7.5, and by a significant margin. More fun? 7.5 of course!

Decide accordingly.

Wait a second, are you saying a 7.5" barrel with be more powerful? Like, more energy?

Edited.

OK, that makes sense.

I thought I was going crazy or really didn't understand what the fuck was going on.

Posted: 2/27/2006 3:24:38 PM EDT

[#8]

32 degrees outside

7.5" - supposidly one of the ultra cool special coated deals. No matter what ammo/buffer/extractor, etc., it was a jam O matic.

75gr. TAP 1868FPS
M855 2239fps
Winchester white box 2151fps
Wolf 2152fps

LMT 10.5" - same day/conditions

75gr TAP 2238fps
M855 2600fps

I'd get an 11.5" My 10.5" runs fine when its warm, but when the temps get below freezing, it wont work.

Posted: 2/27/2006 5:26:03 PM EDT

[#9]

I think some lose sight of the fact that these are just for fun guns and not designed or intended for personal protection.

Heaven knows we have 1911's, .357's, .44's and a host of others that are better suited for that purpose.

Now, having said the above. There's absolutely no doubt that, at 50yds or less, I could place three rounds center mass and the target would not be in a position to do harm.

BTW. I had a ball yesterday tearing up a bunch of paper plates with my Bushy 97S pistol.

Posted: 2/27/2006 5:32:20 PM EDT

[#10]

Quoted:
I think some lose sight of the fact that these are just for fun guns and not designed or intended for personal protection.

Heaven knows we have 1911's, .357's, .44's and a host of others that are better suited for that purpose.

Now, having said the above. There's absolutely no doubt that, at 50yds or less, I could place three rounds center mass and the target would not be in a position to do harm.

BTW. I had a ball yesterday tearing up a bunch of paper plates with my Bushy 97S pistol.

I would love it for fun but I can't help thinking it would be viable as a self-defense weapon. Maybe I just don't understand the numbers well enough.

ETA: I mean the XM177 was 10", wasn't it? I realize full auto is different but still...same velocity.

Posted: 2/28/2006 3:52:06 AM EDT

[#11]

i have my ar pistol for pure giggles and nothing more.

Posted: 2/28/2006 11:09:39 AM EDT

[#12]

Quoted:
i have my ar pistol for pure giggles and nothing more.

A worthy pursuit, sir!

Posted: 3/2/2006 5:58:05 PM EDT

[#13]

This link might help you. LINK

Posted: 3/3/2006 5:38:08 AM EDT

[#14]

I found this on the Kel-Tec PLR-16 website.
It for the 5.56 M193 Ball, from their 9.2" PLR16 Barrel @ 2600fps
It may be of some use.

Chief

Posted: 3/3/2006 7:43:23 AM EDT

[#15]

1NAVYCHIEF-RET and DDofWA, thank you both very much.

Those are great references!

Cheers,

Posted: 3/3/2006 12:24:11 PM EDT

[#16]

IAMLEGEND, You may want to save the jpg that Kel-Tec has on their site, just in case they change or delete it. It is a very good piece of reference material.

Chief

Posted: 3/5/2006 4:21:42 PM EDT

[#17]

With some good Winchester PSPs or HPs "if meat preservation is not an issue"--(saw that on a box of ammo once) it ought to work just fine. Either barrel will have more energy inside a home than a 20" at 300 yds and our boys in the sandbox are using them with great effectiveness.

[ARCHIVED THREAD] - 7” versus 10.5” velocity?

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