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View Full Version : 16" or 20" AR upper W/ A2 stock?


awall919
09-24-2011, 2:51 PM
I have recently acquired a pre-built lower equipt with an A2 style butt stock.
Instead of putting a M-4 style 6 position stock on as a replacement I have decided to keep the A2 style stock with rifle size buffer.

My questions are if I run a 16" carbine or mid-length upper on the A2 lower, will I have any reliability issues? And second what are the merits of a 16" upper as appose to a 20" upper or vise versa?

Keeping in mind that I plan th keep the A2 stock, so should I go with a 20" rifle length upper or go with a carbine/ mid-length upper. Thanks Cal-Gunners, looking forward to your comments.

GettoPhilosopher
09-24-2011, 4:54 PM
AFAIK, you shouldn't have reliability issues with at least a midlength. Don't have personal experience with a carbine, but wouldn't guess so either. I've got a 16" midlength with an A2 stock in my lap as I type. :P

dieselpower
09-24-2011, 5:55 PM
No issues.

tuna quesadilla
09-24-2011, 8:15 PM
I ran a 16" midlength on an A2 lower for awhile. I feel that the heavier A2 buttstock assembly (compared to collapsible M4-type) makes the rifle balance quite nicely.

Dreaded Claymore
09-24-2011, 9:00 PM
I don't think you'll have any problems.

20" barrel for the win. Enjoy more velocity, longer sight radius, more reliable fragmentation, and a longer reach for your bayonet!

motorwerks
09-24-2011, 9:29 PM
No issues.

This

I don't think you'll have any problems.

20" barrel for the win. Enjoy more velocity, longer sight radius, more reliable fragmentation, and a longer reach for your bayonet!

LOL I love that you put in a tidbit about Bayonets. It's once of the reasons I love my 20'' so much. :)

evidens83
09-24-2011, 10:09 PM
Go M16a4 clone!

awall919
09-24-2011, 10:16 PM
I am pushing towards the 20". Anybody dave one they want to sell for 250.00?:43: Id take anything for that price to be honest. This is strictly a budget build.

tuna quesadilla
09-24-2011, 10:40 PM
I am pushing towards the 20". Anybody dave one they want to sell for 250.00?:43: Id take anything for that price to be honest. This is strictly a budget build.

http://i33.photobucket.com/albums/d67/opensourcelinuxm/AR15A2.jpg

You know you want one... And that rifle was only $690... :)

bombadillo
09-24-2011, 10:48 PM
No issues to work with. You'll be good to go with that combo.

Standard
09-24-2011, 10:50 PM
Definitely 20"

resident-shooter
09-25-2011, 1:48 AM
20" barrel has maaaany advantages. the only 2 disadvantages are weight and less portability

slo5oh
09-25-2011, 8:55 AM
Strange not a single person defending the 16" barrel.

Awall919, you might want to frame your question about 20" vs. 16". What's the main purpose for this rifle? Are you planning on target shooting at 100 yards? 600 yards? trying for 1000? Iron sights/red dot or Scoped? Will this be a hunting rifle? What are you hunting? Self defense? SHTF Zombie killer?

Those of you saying 20" is superior, can you shed some light? The little bit of reading I've done on it claims a higher muzzle velocity, about 200fps, the 20" is quieter and there's a slightly flatter trajectory. The common myth though is that the 20" is more accurate. I'm currently weighing the difference between an 18" and a 20", but again from my findings, there's not a huge difference between the 3 of them. The biggest thing seems to be fragmentation distance. On a 20" it's ~200 meters on the 16" it's ~150 meters.

Google ar15 16" vs 20" brings up loads of threads all over the place, ar15.com, thefiringline and ar15armory are some of the ones I give some weight to.

Maddog5150
09-25-2011, 9:54 AM
I have an a2 on a 16 inch carbine for a featureless build. Runs like a champ.

ILVSMOG
09-25-2011, 9:58 AM
I have a 16" midlength A2 as my truck gun and it's served me very well. I would absolutely recommend that combo. I haven't handled a 20" variant, but I can say the 16" handles and stores well and I've never had to take a shot it couldn't handle.

Redchevyman
09-25-2011, 10:04 AM
I have a brand new 20" complete upper with M4 feed ramps. Includes bolt carrier group and charging handle for $395 plus shipping. PM me if you want it.
http://www.gunco.net/gallery/data/500/medium/IMG_0091.JPG

Puuloa
09-25-2011, 10:05 AM
I've tried 16" A2 stock combo, it doesn't look right. Aesthetically, A2 with a 20" look much better, but functions just the same. It all comes down to you. For me 20", leave the 16 on an M4 with collapsible.

awall919
09-25-2011, 10:35 AM
Strange not a single person defending the 16" barrel.

Awall919, you might want to frame your question about 20" vs. 16". What's the main purpose for this rifle? Are you planning on target shooting at 100 yards? 600 yards? trying for 1000? Iron sights/red dot or Scoped? Will this be a hunting rifle? What are you hunting? Self defense? SHTF Zombie killer?

Those of you saying 20" is superior, can you shed some light? The little bit of reading I've done on it claims a higher muzzle velocity, about 200fps, the 20" is quieter and there's a slightly flatter trajectory. The common myth though is that the 20" is more accurate. I'm currently weighing the difference between an 18" and a 20", but again from my findings, there's not a huge difference between the 3 of them. The biggest thing seems to be fragmentation distance. On a 20" it's ~200 meters on the 16" it's ~150 meters.

Google ar15 16" vs 20" brings up loads of threads all over the place, ar15.com, thefiringline and ar15armory are some of the ones I give some weight to.

Thank you for the info. Im leaning towards the 20" rifle length, as Im not planing to kick in doors and sweep out "insurgants". I would just like a reliable AR-15 to plink wih, but is reliable enough to handle field use and
varmint hunting. Im planing on swaping optics from a 1-4x28 scope ans a standard A2 carry handle rear sight.

Can some of you fine educated folks give me some insight between the pros ans cons of a 16" carbine/mid-length as oppose to a 20" rifle length? Please keep in mind that I am keeping an A2 btt stock on the lower.

Thanks guys, Much appreciated.

therealsundance
09-25-2011, 10:51 AM
My questions are if I run a 16" carbine or mid-length upper on the A2 lower, will I have any reliability issues?

Whenever I think I got my stuff together, I see something that reminds me of a question I forgot to ask...

So far everything people have said tells me my plan for a 16" midlength upper on my A2 lower won't have any issues.

Thanks for asking the question I shoulda!
:43:

gun toting monkeyboy
09-25-2011, 10:54 AM
The main things that a 16" barrel has going for it are potability and weight. The shorter barrel is easier to move around in close environments. And it usually weighs less. That is about it. I prefer 16" carbines for some things, and 20" rifles for others. For hunting where I will be out walking around or in a small blind, I prefer a carbine. For just plinking, either will work. All of my ARs will outshoot me, so any difference in accuracy is moot.

-Mb

(edit) No, you will have no issues with the stock and whatever upper you want to go with. As for picking one up for $250, good luck with that. If your budget is that tight, wait and save up for a while longer. Decent uppers seem to start in the $375 range for complete ones.

bombadillo
09-25-2011, 12:17 PM
check palmetto state armory as they have kits for around 399 and I would save up. Their barrels are made by FN and are of great quality. Get one of the 4150 barrels and chrome lined, you'll be all set.

msand951
09-25-2011, 12:26 PM
http://i1213.photobucket.com/albums/cc479/msand951/DSC02884.jpg

I have a 16" set up for feaureless now. Its has a crowned barrel. Its a dpms Ill sell the upper with bcg for 300 plus shipping . Or we can meet up in Riverside CA. It works good I want to upgrade to a flat receiver with a stainless barrel.

resident-shooter
09-25-2011, 12:41 PM
Strange not a single person defending the 16" barrel.

Awall919, you might want to frame your question about 20" vs. 16". What's the main purpose for this rifle? Are you planning on target shooting at 100 yards? 600 yards? trying for 1000? Iron sights/red dot or Scoped? Will this be a hunting rifle? What are you hunting? Self defense? SHTF Zombie killer?

Those of you saying 20" is superior, can you shed some light? The little bit of reading I've done on it claims a higher muzzle velocity, about 200fps, the 20" is quieter and there's a slightly flatter trajectory. The common myth though is that the 20" is more accurate. I'm currently weighing the difference between an 18" and a 20", but again from my findings, there's not a huge difference between the 3 of them. The biggest thing seems to be fragmentation distance. On a 20" it's ~200 meters on the 16" it's ~150 meters.

Google ar15 16" vs 20" brings up loads of threads all over the place, ar15.com, thefiringline and ar15armory are some of the ones I give some weight to.

Thank you for answering your own question. Flatter trajectory is added accruacy of its own. No need to account for distance/height.

slo5oh
09-25-2011, 3:55 PM
Thank you for answering your own question. Flatter trajectory is added accuracy of its own. No need to account for distance/height.

:/
That won't get you near your target past 300 yards once the bullet drop becomes 10" or more.

Found this image over at arf here:
http://www.ar15.com/forums/t_3_12/400585_16andamp__34__vs_20andamp__34__balistics.ht ml

http://img.photobucket.com/albums/v320/tepst12/223Velocitiesanddropchart.gif

Bobby Ricigliano
09-26-2011, 5:10 PM
I run an A2 stock on a 16" carbine and it runs fine. Swap out the pistol grip for a MMG and change the flash supressor out for a brake and you become featureless.

dieselpower
09-26-2011, 5:26 PM
I have a dissipator build full YHM rail and I am thinking about swapping from a M4 stock to an A2. Still mulling it over.

railroader
09-26-2011, 5:42 PM
With an A2 stock I say go with a midlength 16" or a 20". The 16"carbine upper with an A2 stock looks odd. I have a middy with the A2 stock and I like it alot. Here's a pic.

http://img291.imageshack.us/img291/8940/oll0014uy2.jpg

awall919
09-26-2011, 5:44 PM
railroader, I do like the look of your rifle. The mid-lengths do look good with the A2 stock.

21SF
09-26-2011, 6:15 PM
Rifle! Cuz I don't have one.

Anchors
09-27-2011, 1:49 AM
I don't think you'll have any problems.

20" barrel for the win. Enjoy more velocity, longer sight radius, more reliable fragmentation, and a longer reach for your bayonet!

Hahaha that is awesome. :chris:

Coyotegunner
09-28-2011, 12:30 AM
On AR15s,I run a A4 16" light barrel on one when hiking a long way.A 16" heavy when sitting on a stand that I drive to.Or a 24" 204.The AR10 is a 16" carbine also.The heavy I have no use for due to weight.That 204 is bad enough.All A2 stocks with KICKEEZ stick on pads on top.

Sunday
09-28-2011, 11:48 AM
Go with a mid length. better looks and balance and sighting since everybody seems to wants a bench rest accurate carbine. the standard stock works nice. you need the proper extension. The nice thing about the AR is you can swap the top ends so get acomplete 16 inch then save up for the 20 inch of you choice. AR15s you can't have just one!!!

awall919
09-28-2011, 11:58 AM
Yesterday I was fortunate enough to find a BCM 20" upper and had to grab it for the price. So Iv decided to keep the A2 and go 20". Now I just need to decide on a hand guard, Im thinking Magpul MOE as I'v heard that they are pretty lightweight. If not the MOE i'l likely stay with a standard hand guard and throw a small section of rail on the bottom for a bi-pod. I do wish I was able to find a mid-length upper in my price range, I do like the A2 look with the mid-length upper.

tacticalcity
09-28-2011, 12:06 PM
Shouldn't have any troubles at all.

awall919
09-28-2011, 12:11 PM
The only trouble I expect now is keeping her fed a healthy diet of ammo.

NYY
09-28-2011, 2:56 PM
A2 with 20"