11.5 inch barreled AR-15

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I have one of the Eagle (pre-Armalite) XM177e2 clones. It's lighter than my M4 and I haven't had any problems with it. I like the look and feel.
When they did the M4, I am guessing the 14.25 in barrel is the correct length to be able to use the bayonet with carbine length handguards, but I have not got around to testing theory this out.
That and the idea that the AR design needs about 7" of barrel in front of the gas port to cycle reliably.
 
Old Jimmy,

Have you ever chrongraphed your two AR's?? If so what is the difference in velosity between the two??
 
If it isn't an SBR, I don't see the point. If your gun is going to have 16" of something out front, it might as well be mostly barrel in order to get the best ballistics for the length.
 
I recommend this highly if someone is looking for a "Fake" Suppressor but doesn't want to jeopardize the velocity or accuracy of their gun.

add weight to the front end, just to make a "fashion statement"???

I never did get the "form over function" thing....

I guess that's why I'm an engineer and not an artist :)
 
It makes it the legal lenght where you cant own a SBR while giving it a different profile than everybody else with a M4gery on the line.

It makes it lighter in the front to introduce smaller stature shooters to the sport without holding up a heavier rifle.

It was made so I could have something from the era when I was in the service as I always liked the profile of the XM177 over that of the SP1.

It was the SBR of the day in the military, there was no M4gery in the 70's so I bet a lot of people would have rather humped it in the jungle than a full lenght rifle as it would have been a lot handier in the confines of Vietnam as I dont remember reading of anyone but snipers needing to take shots over 200 or 300 yards.

Besides all that it was a FUN project to build and SHOOTS fine for what I built it for and this is the first place I have ever seen anything that had anything but positive coments on the rifle.
 
It was made so I could have something from the era when I was in the service as I always liked the profile of the XM177 over that of the SP1


Besides all that it was a FUN project to build and SHOOTS fine for what I built it for


And that is all that matters. Your reasoning makes perfect sense too me. Hope you continue to enjoy.

I just didn't understand the reasoning when I saw it in the store. My thoughts were if you got to have 16 inches anyway they may as well all have rifleing & if you want a SBR then get a SBR. I would guess that many who buy in that configuation are buying for other reasons, but the fun factor is a big one. Glad you like your rifle.
 
I guess that's why I'm an engineer and not an artist
You got it wrong...I'll fix it for you: I guess that's why I'm an Engineer and not an [strike]artist[/strike] Architect. :D
 
well I never seen the point in it either ......but this thread has some pretty decent answers in it .....

that said I would still have to get a great deal on one before I would just buy it...
 
The flash hider on the original XM-177 series was a sound moderator with baffles. It has been classified by the ATF as a suppressor. It gave the weapon a distinctive appearance.
 
XM177 clones are just bad ass looking. I heard of a lone soldier in Iraq who was separated from his squad and was carring one of those rifles. He got separated from his squad and was lost, walking down the road. Suddenly, he was ambushed by about 50 terrorists, all from chechnya, and everyone of them have slit a throat before. They stared at the soldiers rifle for a couple of seconds, dropped their weapons and fearfuly ran away. About 14 terrorists committed suicide right there.

Those XM177 clones are nothing to mess with. ;)
 
A flash suppressors have 2 specific functions per Colt in the design of the original "M-16".
1st is to reduce the forward viewing of the muzzle flash at night from the enemies position. Thus the name "Flash Suppressor". With the flash suppressor, the flash blast is split into 5 different directions reducing the chance of locating where the blast came from.
An M-16 at night without the suppressor is a fire breathing dragon, like a .357 magnum is.

The 2nd purpose is by far the most important as mentioned earlier. It is a muzzle break to reduce barrel climb and recoil, but mostly to reduce the amount of back gassing so the gas operated ejector is properly pressured so that it functions properly

I like the looks of the longer suppressor and I'm sure it well serves its purpose. It is a very sweet rifle.
 
The 2nd purpose is by far the most important as mentioned earlier. It is a muzzle break to reduce barrel climb and recoil, but mostly to reduce the amount of back gassing so the gas operated ejector is properly pressured so that it functions properly
What?
 
The 2nd purpose is by far the most important as mentioned earlier. It is a muzzle break to reduce barrel climb and recoil, but mostly to reduce the amount of back gassing so the gas operated ejector is properly pressured so that it functions properly
You need "back pressure" for proper cycling in a gas gun (whether it be piston or direct impingement)...not the other way around. :)
 
Bad verbiage I guess.
I screwed up and used the term Ejection should have used "Direct Impingement" as noted just above here, and that with my little bit of understanding, assists operating the bolt cycle. Not ejecting and extracting the spent casing.

Been a long time since I screwed around with an M-16.
I'm tryin to use a 35 year old memory in a 50+ year old brain, on a bunch of younguns' and people that have studied this stuff a bit more than me.

I didn't study the M-16 or it's clones, I just shot it when I had to.. If I remember right the model I shot was an H&R, and not a Colt

The flash suppresser does reduce the back gassing as I indicated - It doesn't eliminate it. Gassing as noted in the Wiki definition explains some of the issues with condensation, corrosion and wear from the back gassing. Colt reduced some of it with the break, but managed the rest by what I would think would have been barrel length and placement of the gas tube location in the barrel assembly. The engineering is way more than most of us on this forum will ever be able to accuratly calculate. Simply put - too much pressure is a bad thing, too little and the rifle fails to cycle properly.
The thread had comments about the "Flash Hider" and there ain't no such thing. It's a "flash suppressor".
I also just read that the design was actually to protect the shooters eye sensitivity at night by dividing the flash into different directions thus reducing the flash blindness of the shooter, as well as reducing the visible flash from the enemies view.

When I'm wrong (not if), I'll accept and admit my errors.
Don't be so quick to judge or so hard on everybody's mistakes, work on correcting them with a little bit of compassion and understanding. You didn't get that damned smart overnight either.

Yeah, your quick judgements, statements and willingness to slam me for making an honest mistake frosted my butt, but your turn will happen and you won't much like it either.
It's no scratch off my back. You don't know me anymore than you know your president. And you don't like him either. But like being stuck with him, your stuck with me. Until they kick me out and ban me from this forum you'll hear my comments, opinions and questions even if they are wrong, because we're all human and we make mistakes

Not a one of you gets it right every time either. If you did, you would be your parents.
The way we learn is by working with others, not insulting them because of a mistake.
Bad attitudes are what makes people leave a forum, not much of anything else.
Keep up the good work and we stick around.
There have been many forums crushed by bad attitudes and this one is headed in that direction too, from they way you are constantly flaming on others.

I'll read for a while but you won't see me post because I'm tired of your cocky attitudes slamming me every time I try to get out an opinion.

And as they say ---That's my 2 cents worth.
 
GC, I think you need to ease up a little bit...I don't see a single insult or bad/cocky attitude in the above posts. Perhaps one was deleted and I missed it, but either way you need to cool down a little...this is definitely not high road. :)
 
Why?

Because it's part of the hobby. One person's preferences are not more important than another person's. The 2nd Amendment protects all, equally.
 
I would be interested to see data that indicated that adding an A1/A2-style flash hider decreased rearward gas flow through the barrel or gas tube in an AR-15 action, compared to the same barrel with no muzzle device.

It is known that "Krinkov" style muzzle devices increase gas pressure dwell time and aid action operation of very short barrels on some action types. (The same is true for sound suppressors.) These, at least, do not decrease it. The problem with very short barrel lengths is that the dwell time of the pressure in the gas tube can be too short due to gas port to muzzle distance being too short (limited by high pressure at very short gas system lengths and the desire for a short barrel on the other). I have been involved with testing a 7.5" upper which runs reliably with a sound suppressor but not a normal muzzle device.
 
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