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Old November 19th, 2009, 00:09   #1
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FPS and BBs weight

I ordered a new AEG and the website from which I bought it from state that it has a rough estimate of 400 fps using .20 BBs. This website in the past has proven to be reliable as the last AEG I bought from them was rated at 350 fps and shooted at 340 out of the box.

I am fully aware I could replace the stock M120 spring to a M90 or M100 but I've read somewhere that disassembling this very AEG was a chore and taking into consideration that I have never opened a gearbox before that isn't something I would like to try at the very moment.

How would I go about loading .28 / .30 instead of the usual .20? This website here suggests that using that particular mass would reduce the fps bellow 350.

0.20 at 400 fps = 122 m/s and 1.49 Joules
0.30 at 327 fps = 100 m/s and 1.49 Joules

Now I'm no rocket scientist but theses numbers above tells me that both BBs will cause the same amount of energy on impact but one being under 350 fps. Now the question is, would my AEG using 0.30 BBs and shooting under 350 fps be accepted in a CQB game limited to 350 and bellow fps?
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Old November 19th, 2009, 00:14   #2
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All FPS readings are done with .2's So regardless what ammo you use you'll still be over the limit. Also look at your own math, Notice how the joules are the same? That's what matters. Joules=ouchies FPS means nothing.
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Old November 19th, 2009, 00:27   #3
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Your only solution is to have a reputed guntech to swap the sring for you. Using a velocity reducer is not a good thing for CQB, as those things fail rather quickly and you will only know it when someone come to you with blood in their face asking you to chrony your gun... wich is very BAD.

Like mentionned before, fps use a 0.20g BB benchmark. We should use a joules terminology, but it's not very popular and well understood by the mass.
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Old November 19th, 2009, 00:28   #4
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heavier bb's carries MORE energy... so basically if you gun shoots 400 fps with .20g and you shoot .30 from the same gun @ let say about 340-350 they will hurt MORE than the .20's

not a soution... change the spring. also all testing is done with .20

and witch aeg do you refer as a pain in the ass to dissasemble?
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Old November 19th, 2009, 00:32   #5
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That's what I thought but I wasn't completely certain. So theoretically CQB matches aren't restricted to 350 fps as everyone might believe but 1.14 Joules instead? Interesting. Thank you for the answers nonetheless.
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Old November 19th, 2009, 00:35   #6
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That's what I thought but I wasn't completely certain. So theoretically CQB matches aren't restricted to 350 fps as everyone might believe but 1.14 Joules instead? Interesting. Thank you for the answers nonetheless.
cqb is restricted to 350fps with .20 gram bbs... but again remember 350 fps isnt a goal its a limit... aim for something like 300-310... lol my cqb guns are at something like 260-280fps
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Old November 19th, 2009, 00:38   #7
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That's what I thought but I wasn't completely certain. So theoretically CQB matches aren't restricted to 350 fps as everyone might believe but 1.14 Joules instead? Interesting. Thank you for the answers nonetheless.
Pretty much. However everyone generally uses the term limit of 350FPS with 0.2g, because its easier to understand for people who are not familiar with units of energy.
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Old November 19th, 2009, 00:39   #8
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Originally Posted by lemegacool View Post
cqb is restricted to 350fps with .20 gram bbs...
Haven't you read what I wrote? 0.20 BBs at 350 fps equal 1.14 Joules. So in theory my AEG would have to shoot at 285 fps to use 0.30 BBs as it would once again equal 1.14 Joules. I'm just making a point here.
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Old November 19th, 2009, 00:44   #9
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Quote:
Originally Posted by Foxx View Post
Haven't you read what I wrote? 0.20 BBs at 350 fps equal 1.14 Joules. So in theory my AEG would have to shoot at 285 fps to use 0.30 BBs as it would once again equal 1.14 Joules. I'm just making a point here.
yeah you are right! srry i miss readed. on another note... are you planning on using .30's on cqb... i just say that because .25 seems to be enough for cqb ranges and does not cost too much compared to .30's but again its up to you
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Old November 19th, 2009, 00:46   #10
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I would just like to add that I personally do not see a point in using heavier BBs in CQB games. Its not like you have to shoot through leaves and twigs and have it go a long way.
I find using 0.2g just fine for indoors.
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Old November 19th, 2009, 00:52   #11
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Originally Posted by lemegacool View Post
yeah you are right! srry i miss readed. on another note... are you planning on using .30's on cqb... i just say that because .25 seems to be enough for cqb ranges and does not cost too much compared to .30's but again its up to you
No harm done buddy. I am not planning on using 0.30 BBs either, there is no way I could justify such a drastic drop in fps. Though using 0.25 at 310 fps sounds interesting. But then, I haven't read a whole lot about ball bullets and wouldn't know if the benefit of using heavier BBs outweigh the drawbacks in fps. 0.25 and an M100 spring, what do you people think?
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Old November 19th, 2009, 00:53   #12
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I would just like to add that I personally do not see a point in using heavier BBs in CQB games. Its not like you have to shoot through leaves and twigs and have it go a long way.
I find using 0.2g just fine for indoors.
i guess it depends on the field's configuration... at action500 where we play there is some "large" open aeras that can reach 100' i like having a little more flight time with .25 in that case

but in a "building" setup well yeah .20 all the way!


btw foxx i use sp90 springs (m90) with .25's
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Old November 19th, 2009, 00:56   #13
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You won't really see a difference between 0.20g and 0.25g BB in CQB. I mean, real CQB in a building and not a CQB-paintball field. 0.25g bb start to shine beyond 100fts with their nice ballistic.

in CQB, I run my P90 with 0.25g generally, simply because I don't buy 0.20g anymore. I shot my last bag of 0.20g last summer.
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Old November 19th, 2009, 00:58   #14
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You won't really see a difference between 0.20g and 0.25g BB in CQB. I mean, real CQB in a building and not a CQB-paintball field. 0.25g bb start to shine beyond 100fts with their nice ballistic.

in CQB, I run my P90 with 0.25g generally, simply because I don't buy 0.20g anymore. I shot my last bag of 0.20g last summer.
lol i dont buy them anymore too... i just kept a bag to chrony my builds and upgrades...
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Old November 19th, 2009, 01:03   #15
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Originally Posted by FOX_111 View Post
You won't really see a difference between 0.20g and 0.25g BB in CQB. I mean, real CQB in a building and not a CQB-paintball field. 0.25g bb start to shine beyond 100fts with their nice ballistic.

in CQB, I run my P90 with 0.25g generally, simply because I don't buy 0.20g anymore. I shot my last bag of 0.20g last summer.
I already have two other AEGs, this particular one is going to be my primary which I will probably use for indoor and outdoor matches while I have a secondary which is perfect for CQB as it shoots roughly 310 fps using 0.20. And the third one is for backup if shit hits the fan. So considering the above, wouldn't it be best for me to switch to a m90 spring and 0.25 already?
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