Max fps & hop up

[Mladen]

Can you please explain "Hop-up", and when a gun says that it fires at 360 FPS with adjustable hop up does this mean i can adjust the fps?

thx

[Amos]

No, it means you can adjust something that puts back-spin on the BB to increase it's range while it flies through the air.

[pusangani]

what does an airsoft hopup do - Google Search

no it just means that the gun shoots at 360 fps and that the hopup is adjustable

[L473ncy]

Hop up does decrease FPS from what I understand, but not by a significant amount. ie. on full hop, you might lose a few FPS but not enough to bring an outdoor gun shooting 395 FPS to CQB levels of play.

Hop up's main use though is to give the BB backspin so that it can stay on a straighter path for longer (thereby giving you a longer maximum effective range).

[Mladen]

ok, the majority of the guns that i've looked that should be for CQB (G&G MP5 and G&G AK74) all shot at 360 fps; but they only allow max 350 fps to play indoors in toronto, what guns (other than pistols) are under 350?

[pusangani]

try looking at other brands maybe? most ics guns are 330 stock

[gmds44]

Originally Posted by Mladen

ok, the majority of the guns that i've looked that should be for CQB (G&G MP5 and G&G AK74) all shot at 360 fps; but they only allow max 350 fps to play indoors in toronto, what guns (other than pistols) are under 350?

G&G's claim to be 360FPS
However, I Chrono'd both my M4 and MP5 and they were both giving me ~350fps readings.

[Dart]

Originally Posted by Mladen

ok, the majority of the guns that i've looked that should be for CQB (G&G MP5 and G&G AK74) all shot at 360 fps; but they only allow max 350 fps to play indoors in toronto, what guns (other than pistols) are under 350?

anything Made by TM that is still stock should be shooting roughly 280-310. If you get a gun thats shooting hot its not a huge headach to swap out the spring to something like an m90. www.mechbox.com and www.google.com are both your bibles. If you really want an easy gun to change FPS look at ones like the Ares Tavor Tar21 and the l85 *I beleive the latter has it correct me if I am wrong*.

[m102404]

So...this thread makes a bit more sense now....

The bottom line is: You won't know until you chrony the rifle with 0.20g BBs.

But...

1. Manufactures often report the highest FPS that they read off a test model...and the hopup may or may not be on. (without it on, you'll get the highest number...good for the marketing guys). They may also chrony with lighter than 0.20g BBs...so that 490fps rifle might not really be what's printed on the box so far as the local fields are concerned.

2. Springs/setups...IMHO...settle in a bit most times. Dropping a couple of FPS (unknown how many) is not uncommon. Who knows how long that mechbox has been assembled for and what state (piston forward vs. other) it's in.

3. As a general rule guys chrony their guns with their hopups set to where they're going to use it. And...turning on the hopup a bit does drop the FPS of the BB a bit...sometimes dramatically.

So...again see above...you won't know until it's chronied. Get out to a game field...set the hopup. Then chrony it. If it's hot...at least you'll know by how much (it'll give you a hint as to which spring to buy, etc...).

Aim lower than the maximum...if it's 350 aim for 300-330. If it's 400 aim for 360-390. The last 10fps doesn't matter at all...and not every setup is absolutely predictable. I.e. swapping a M100 from a M120 in my rifle might end up dropping the FPS from 420 to 340...but doing the same in yours might yield very different results. Go back to the chrony to be sure.

Being new, not knowing your way around a mechbox and having to swap out a spring is a pain in the ass. Get someone else to do it for you

Best of luck,

Tys

[Dart]

I typed my post a little bit on the tired side. Basicly what I am trying to say with the spring swap is its not as scary as people make it sound. I waited roughly a year before cracking my mechbox open but when I finaly got the nerve to do it I went "this is what people are scared of? its just some springs and gears and moving parts....* mind you I do have a mechanical and IT background....

If you do end up getting a TM with a stock gear box, if you want to bump the FPS up just be warned that you do have to change the bushings out from nylon. Heavier spring causes more friction... friction causes heat.... plastic VS heat, heat wins.

*btw some fields do require the hop up to be off for crony.*

[Mladen]

You guys are really helpful, i really appreciate it.

So what i gather from this is if i get the gun i really want (G&G Ak74 Spets) which is advertised at 360 fps,

- it is a safe assumption that it fires less than 360 with hop-up actived
- even if it does fire more than 350 with hop up, changing the spring will bring it down

Do these make any sense?

I'm a engineering studtent i my last year of study so i'm going to assume than changing the spring is something i'll be able to do, cause i saw a your tube video about the field striping of this gun and the spring is very accessible.

Originally Posted by m102404

So...this thread makes a bit more sense now....

The bottom line is: You won't know until you chrony the rifle with 0.20g BBs.

But...

1. Manufactures often report the highest FPS that they read off a test model...and the hopup may or may not be on. (without it on, you'll get the highest number...good for the marketing guys). They may also chrony with lighter than 0.20g BBs...so that 490fps rifle might not really be what's printed on the box so far as the local fields are concerned.

2. Springs/setups...IMHO...settle in a bit most times. Dropping a couple of FPS (unknown how many) is not uncommon. Who knows how long that mechbox has been assembled for and what state (piston forward vs. other) it's in.

3. As a general rule guys chrony their guns with their hopups set to where they're going to use it. And...turning on the hopup a bit does drop the FPS of the BB a bit...sometimes dramatically.

So...again see above...you won't know until it's chronied. Get out to a game field...set the hopup. Then chrony it. If it's hot...at least you'll know by how much (it'll give you a hint as to which spring to buy, etc...).

Aim lower than the maximum...if it's 350 aim for 300-330. If it's 400 aim for 360-390. The last 10fps doesn't matter at all...and not every setup is absolutely predictable. I.e. swapping a M100 from a M120 in my rifle might end up dropping the FPS from 420 to 340...but doing the same in yours might yield very different results. Go back to the chrony to be sure.

Being new, not knowing your way around a mechbox and having to swap out a spring is a pain in the ass. Get someone else to do it for you

Best of luck,

Tys

[Rock 'N' Roll Outlaw]

When you chrono a gun you should always take the hop-up all the way off. Otherwise your not getting proper results and your gun would be illegal for an event that has a 350 limit. If you want to reduce your fps the only way to do that is change the spring. Become friends with someone who knows their way around a mechbox and can show you first hand the procedure, then once you feel comfortable enough to do it on your own you will be able to do this very easy. Also don't rely on "velocity reducers" as they rarely work and wear down very quickly. Waste of money and you risk injuring players with a hot gun.

[pusangani]

The g&g beta spetz shoots like 330-340 not 360, I used one at splatter's last week I'll have it there tomorrow as well if you want to check it out.

[L473ncy]

Originally Posted by Mladen

I'm a engineering studtent i my last year of study so i'm going to assume than changing the spring is something i'll be able to do, cause i saw a your tube video about the field striping of this gun and the spring is very accessible.

If you're in Mech Eng, IGEN, Civil, or anything really it should be a piece of cake.

This is coming from a CS student (AKA the Elec Eng applicants who didn't make it). I've opened up springers and GBB's before to clean, and lube. It's not a big deal, and I've seen my gundoc work on my gun before and it looks simple enough for anyone with aptitude in mechanical systems.

PS: http://www.mechbox.com is your friend.

[Mladen]

lol

i think i'm going to make my life a bit easier by just buying a gun that's rated at 350 fps, like maybe the G&G M4 CQD.

Once i get the handle of airsoft then i'll start playing around with custom work maybe for an outdoor rifle...

thanks for the help guys.