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Old February 10th, 2010, 18:34   #11
Join Date: Feb 2010
Location: Toronto, ON
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 View Post
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.


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 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 won't know until it's chronied. Get out to a game field...set the hopup. Then chrony it. If it's 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,

Mladen is offline   Reply With Quote