KWA M16 OR M4

[DMitri]

Look down all the inner barrels you have. (With them out of your rifle, preferably.)

Are the scratches near the front (end of barrel) or rear (at mechbox)?

I would argue that the longer the bb stays in the barrel the more time the air has to displace evenly around the bb, making it's path straighter, and reducing friction as it travels down the barrel. This would result in the straighter path (read: increased accuracy/range) outweighing the negligible additional (not increased) friction.

[Antilogic]

I'm pretty sure that jester is saying that the increased time the bb has to accelerate has a much greater impact on range than the small amount of friction between the bb and the barrel.


Ed.
well i guess dmitri posted when i did. poo.

[CommieHunter]

Theory is awesome. And I think the theory is pretty much set that a longer barrel increases accuracy.

How about we do a test? 509mm v 363mm. Same distance, same conditions, same bbs. Different targets, and take a picture.

Can't argue with results.

[Jester316]

I would do it, I have an m14 and an mp5, but my m14 is messed up right now. Need a new bucking me thinks. BB's go about 40 feet than curve very nastily to the left. So, hopefully someone else can do it.


Edit:

So Sig, since you have posted after my comment, I'll take it that you agree with everything I said. So, in your last post you said the friction of the barrel was slowing in fact slowing down the bb. I will concede this point, but only after I clarify. The friction of the bb bouncing around the barrel slows down the bb, but the air behind the bb is still accelerating it. So, because of the friction, the bb will not accelerate to its full potential. Ok, I'm going to put this as simple as I possibly can: as long as the pressure behind the bb is higher than the pressure in front of it, it will accelerate. This means that the entire length of the barrel the bb is accelerating. Yes it is not reaching its full potential, but it is not slowing down until after it leaves the barrel and the pressure behind the bb equals the pressure in front of it.

[Carpet]

I have an M14, you can do the MP5, and Ill do the M14.

[DMitri]

For the test to be accurate, you would need to swap barrels in ONE gun.

[LiquidSnak]

look, I'll take grouping photos with my 363mm and my 470mm barrels, both @ 50 feet. whatever grouping is tighter obviously has more accuracy. and more accuracy is more range, since the bb is flying straighter farther. and just to be sure, I'll do it at 100 feet after, since I have a fast swap barrel system going in my M4.

[CommieHunter]

Perfect. Thanks for offering to do that LiquidSnak.

[Sig68]

i really don't care anymore guys. i don't need to do testing or anything. i just know the principle of physics. and when you shoot an aeg there is no expansion of gas in like a gas blow back. i can't remember who said that they work the same, but they don't.

[Nocte]

It's not we care if you need to see the results or not, we just want to prove you wrong with irrefutable physical evidence (in addition to the self-proclaimed physics experts that pop up from time to time), so you'll have to forgive the community for running the test anyway to have something to reference back to.

Some day I'll convince and old friend to visit AP to dispell a few myths about this kind of stuff. I think his master's degree in physics might lend him a little credibility. Maybe it'll wind up as an article...

[Haloeclipse]

i really don't care anymore guys. i don't need to do testing or anything. i just know the principle of physics. and when you shoot an aeg there is no expansion of gas in like a gas blow back. i can't remember who said that they work the same, but they don't.

truthiness, you dont need no damn science to back you up! All you need is that gut feeling that says your right.

[Jester316]

Sig, where did you take physics? I took 2 years in high school and an entire year in college. Also, I said that AEG's and GBB's work the same. And they do. Maybe not exactly the same, but they work on the same principle. Expanding gas is channeled in a way that pushes a bb down a length of barrel. Yes, that is extremely cut down, but that IS how it works. If you don't believe me, than please post how each one works in a different way. The only difference is the method of compressing the gas (whether Coleman does it, or TM/CA/G&G/G&P/VFC/Systema/Deepfire...).


Ok, so stop thinking of it as expanding gas (when gas is compressed, it wants to expand. The only way for it to expand is into the bb. But lets stop talking about this and move on to another principle). Think of it as pressure. The pressure behind the bb is higher than the pressure in front of the bb. As long as the pressure behind it is higher, the bb will accelerate. When that pressure evens out when the bb leaves the barrel, that is when it slows down. This is the same principle behind those messenger tubes. The air pressure in front of the canister is lower causing a "sucking" effect. The canister will move through the pipe until the air pressure equalizes.

Let me put it another way. I'm trying to find ways that you will understand. Your body is full of airsoft barrels (insert hot dog joke here). Your veins and arteries are hollow tubes, just like an airsoft barrel. Your heart is the gearbox (stick with me on this, I think it will work out). Your heart contracts (like the spring releases), compresses blood ([yes, blood is a liquid and can't be compressed, but don't ruin my analogy] like the piston compresses air), and increases the pressure behind the blood (like the puff of air behind the bb). This increase in pressure moves the blood down the arteries (like the air moving the bb down the barrel). This is why you have a blood pressure. If the pressure in your arteries was 0, than you would be dead. (Ok, so in my head this example worked, but some might not see it).

[LiquidSnak]

[URL=http://g.imageshack.us/img204/dscn0361qq0.jpg/1/]

I put a line between the farthest apart shots in each group. The gray circle is 1" in diameter. Hopefully you can read the writing under each one, but 470 is on the left and 100ft is on the bottom

For the sake of science, I used calipers on each bb, and found 20 of the closest to 5.97mm diameter I could, using airsplat ammo, which is pretty decent. I measured two diameters across each one, to be sure of roundness as well. It was a painstakingly shitty process, but hopefully noone can argue now that length = accuracy at distances and common weapons sense says accuracy at a longer distance away = higher effective range. Case closed, and out of the kindness of my heart I shall refrain from calling you a noob.

[LiquidSnak]

And yes, liquid can be compressed, by the way.

[Jester316]

http://www.physlink.com/Education/AskExperts/ae15.cfm

Yes, you can compress liquids, but it is EXTREMELY DIFFICULT to do so. The energy required does not equal the gains therefore it is impractical. This is why hydraulic cylinders work so well for construction equipment (among other things).