Site Notices
7/23/2014 4:06:00 PM
Author
Message
drrocket
Offline
Posts: 460
Feedback: 0% (0)
Posted: 7/3/2007 12:50:01 AM
I'm looking for long range accuracy for my AR15 lower. What kind of groups can I get and how far can the 5.56 be effective?

And you can't say "get both" because there are three choices.
drrocket
Offline
Posts: 463
Feedback: 0% (0)
Link To This Post
Posted: 7/4/2007 2:38:29 PM
BTT for the holiday crew
DemonLoneWolf
Offline
Posts: 641
Feedback: 0% (0)
Link To This Post
Posted: 7/4/2007 2:40:01 PM
18" is good. You don't need a lot of barrel length with the 5.56-.223 to be accurate.
87GN
Leader of the free world
Offline
Posts: 3493
Feedback: 100% (81)
Link To This Post
Posted: 7/4/2007 2:40:33 PM
I don't think accuracy will vary a whole lot between the three, but you will get more velocity (and thus a longer range) from the 24".
glocks are ugly
SWS
The Gold Member
Online
Posts: 5815
Feedback: 100% (7)
Link To This Post
Posted: 7/4/2007 2:42:24 PM
I've got the 20" "varmint" barrel from a few years ago. (Fluted, free float, etc.)

Works good.
www-glock19-com
insert something witty
Offline
Posts: 8586
Feedback: 100% (55)
Link To This Post
Posted: 7/4/2007 2:47:43 PM
I have a 18 RRA varmint

I bought it mostly because I liked the looks of it better than the other lengths


with gold medal match federal 69gr it will shoot about 2"-2.5" at 300M if I do my part

even with 5.56mm south african it will shoot just a around 4"at that distance

I have been very happy with the rifle
colklink
Paris Hilton is now free!
Online
Posts: 5235
Feedback: 100% (4)
Link To This Post
Posted: 7/4/2007 2:49:48 PM
I would go with the 20" myself.
Being an asshole has a reward all its own

My ignorance amuses me greatly

Remember kids, there are no stupid questions, just stupid people who ask questions.
rob99rt
Team Member
Offline
Posts: 603
Feedback: 100% (4)
Link To This Post
Posted: 7/4/2007 2:50:54 PM

Originally Posted By drrocket:
I'm looking for long range accuracy for my AR15 lower. What kind of groups can I get and how far can the 5.56 be effective?

And you can't say "get both" because there are three choices.


I've got a 24" 1:12 twist RRA SS upper on a Bushy lower with an LMT 2-stage trigger. With the 50 grain Black Hills blue box ammo I can punch sub-MOA groups with it all day long at 100 yards (that's the longest I can shoot on our range).

The rifle, however, is certainly only good for a bench/prone gun, though... it weighs a ton. I've tried hiking it around in the woods before and it's too heavy to haul up and down hills, and unless you've got a rest on a tree, sitting on your rear with it resting on your knee, or are prone with it, you can forget about holding it on target easily. It's just WAY too front-heavy... It's honestly easier to hold my 16" HBAR with 1 1/2 lbs of suppressor on the end of it while standing than the 24" rifle.

If you're going to be taking it out and hunting with it, then I'd go for an 18" or 20" barrel. If you're doing bench/prone shooting primarily, then get the 24". You'll lose a little velocity with the 18" over the 20", but that won't affect your accuracy any. Accuracy won't necessarily improve with the barrel length, but velocity will go up a little as you go longer, so you'll get a bit more range out of it.

You might have to play with ammo once you get the barrel. Mine likes what I mentioned above... your might like something different.
- Rob
A free people ought not only to be armed and disciplined but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government. George Washingto
Quintin
Coming to a handrail near you.
Offline
Posts: 4668
Feedback: 100% (2)
Link To This Post
Posted: 7/4/2007 2:51:17 PM
If it's gonna be something you're gonna shoot off the bench and not tote around much, I'd go with the 24 just for a little extra velocity downrange. With a 1:8 twist and a Wylde chamber.
That's why you lost the Civil War. Sherman marched across the south looking for pop, and everywhere he stopped you guys angered him by playing stupid. He didn't quit looking until he got to the Atlantic Ocean. All your fault. - swingset
RooBear
Offline
Posts: 114
Feedback: 0% (0)
Link To This Post
Posted: 7/4/2007 3:02:57 PM
[Last Edit: 7/4/2007 3:03:24 PM by RooBear]
Dito with what Quintin said, the 20 inch with 1:8 twist and don't look back.
55Kingpin
Offline
Posts: 1812
Feedback: 100% (28)
Link To This Post
Posted: 7/4/2007 3:25:45 PM
20"

In 5.56, anything over 20 is just extra weight. There is no added benefit, IMHO.