Tm hi capa 5.1 range
 

hello,
I would like to know if there is really a difference(velocity,range, accuracy) if I use a 7 inch 6.01 inner barrel instead of a 5 inch 6.01 one.
thanks

Yes.

Yes, it'll boost your FPS by around 30 or 40.

And if I get the same fps on both 7 inch barrel and the 5 inch one, how much the range will be affected?

You won't get the same FPS.

But in a theorical world where the FPS would be the same, you won't get any more range. You will however get a lot more shot-to-shot consistency and overall accuracy.

ok thanks guys:)
I'll take a 5 inch precision barrel, upgrade it and use green to acheive the same fps as the 7 inch one.(to get the same range. After all I'm not using it for ipsc...)

Also a 7 inch barrel will require a compensator, silencer or total lack of style.

Unless you unload your wallet on upgrades, your gun will *not* achieve the same fps as a gun with a 7" barrel. I think its pretty much impossible to match a 7" barrel with an upgraded gun using a 5" barrel.

sorry, I didn't understand your point.
Do you mean "will not achieve the same fps as a gun with 7" barrel"? and what is impossible?

See my post. If he increases his barrel from a 5" to a 7", he WILL see a significant FPS jump.

The reason why a longer barrel gives you an FPS boost is because the gas has a longer time to expand and force the BB to accelerate. This works to a certain extent though, once the gas has all expanded it doesn't matter if you add in a longer barrel it will max out at a certain FPS after all the energy from the expansion of the gas has been transferred to the BB.

Also you will see an accuracy increase but it only works to a certain extent. If one barrel is kinked slightly it will affect your accuracy even if it's longer, so straightness is important which is why "ABC companys" 6.01 mm barrel might be crappy and super kinked and make your shots inconsistent but "Big brand names" 6.04 mm barrel which is straighter might give you better accuracy.

I think he means it'll take more cash/upgrade to make a 5" gun to match the FPS a 7" barrel alone can offer.

6.01 yields higher FPS than 6.03, but the latter achieves better accuracy. Of course, the diameter of the BBs used matters as well.

Do you know what is the minimum length of the barrel for the gas to expand?

I don't think thats necessarily accurate. The design of GBB, at least the Negative pressure based system, will keep releasing gas until the BB has physically left the barrel, causing the pressure at the BB side of the nozzle to drop, thus shutting off the floating valve and initiate the blow back cycle and trip the gas shut off and all that jazz. Which means longer barrel, the gas will keep flowing until the BB exists. AEG and springer works on a constant volume of air being "compressed" through the stroke and diameter of the piston, GBBs that number is not constant. Its also the same reason why a heavier BB actually may not loose as much fps in a GBB, since the BB is moving slower, more energy of the gas is being imparted onto it since it stays in the barrel longer.

The only way that you "fully expand" the gas is if you physically emptied the mag supply of gas...

And what is the range of a hi capa 5.1 with a 5 inch 6.01 precision barrel?(using 20 grams bbs)