hot cqb aeg
- Thread starter mimozine
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ImTriggerHappy
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- Feb 25, 2015
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Impossible to call without knowing what spring is in it now.
I use an m85 for cqb and hit 322fps in my Sig but have had to use an m100 in other guns to get same results.
Cylinder,airseal,nozzle,hop up and barrel all contribute.
I use an m85 for cqb and hit 322fps in my Sig but have had to use an m100 in other guns to get same results.
Cylinder,airseal,nozzle,hop up and barrel all contribute.
Sitting Duck
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- May 11, 2014
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As Trigger said - very difficult to call
Springs vary from manufacture for a start - often springs can be a bit over their rating
length of barrel can increase fps - joule creep on longer barrels plus tbb can knock it up a bit further
a mp5k 110/140mm barrel will probably have m110 to equal a 363mm on m100
plus some longer barrels like AK's 455mm to R85's with 510mm+ may have a m90 to equal an aprox 340fps - ish
The " ish " factor comes into play even more variables even if all guns mentioned have 101% seals and compression.....
An ultra light piston Vs heavier piston "may" increase fps very slightly from piston returning a bit faster in theory
But more so if AoE is corrected then 10fps drop aprox will take place
if bearing spring guide used and/or piston bearing bearing used - each of those factors can add on 15fps aprox
So you can see one mp5k with m100 could hit near 300 not 328fps
and another gun AK47 with bearing spring & piston spacer could hit 365fps say on the exact same spring
Sounds bollox but these examples I and others have witnessed the results so it is at best a calculated guess based upon previous builds
even then if all is perfectly sealed you get some wtf's ???
You say cqb - so gonna guess aprox 275-300 barrel - ish (do love an ish)
so my guess shs m100 to Element m105 max if correcting AoE
if still down add bearing spring guide for 15 fps more aprox
That is my rough workings out so far - still not 101% accurate due to loads of variables like I mentioned
Hope this helps - but don't sue me if I am way out
Springs vary from manufacture for a start - often springs can be a bit over their rating
length of barrel can increase fps - joule creep on longer barrels plus tbb can knock it up a bit further
a mp5k 110/140mm barrel will probably have m110 to equal a 363mm on m100
plus some longer barrels like AK's 455mm to R85's with 510mm+ may have a m90 to equal an aprox 340fps - ish
The " ish " factor comes into play even more variables even if all guns mentioned have 101% seals and compression.....
An ultra light piston Vs heavier piston "may" increase fps very slightly from piston returning a bit faster in theory
But more so if AoE is corrected then 10fps drop aprox will take place
if bearing spring guide used and/or piston bearing bearing used - each of those factors can add on 15fps aprox
So you can see one mp5k with m100 could hit near 300 not 328fps
and another gun AK47 with bearing spring & piston spacer could hit 365fps say on the exact same spring
Sounds bollox but these examples I and others have witnessed the results so it is at best a calculated guess based upon previous builds
even then if all is perfectly sealed you get some wtf's ???
You say cqb - so gonna guess aprox 275-300 barrel - ish (do love an ish)
so my guess shs m100 to Element m105 max if correcting AoE
if still down add bearing spring guide for 15 fps more aprox
That is my rough workings out so far - still not 101% accurate due to loads of variables like I mentioned
Hope this helps - but don't sue me if I am way out
Sitting Duck
Supporters
- May 11, 2014
- 4,894
- 1,735
just another thought......
if piston was full metal rack you could short stroke it a couple of teeth
this is only for sad speed freaks tbh - remove 2 teeth & AoE corrected might do the job
(can't reall short stroke full cylinder guns like ak's but medium length barrel guns can be SS carefully bit by bit)
but tbh get a m100 spring is probably quickest & easiest all round solution rather that cut off teeth n crap
(I screwed up first time around so I don't advise this - get a lower spring - job done (hopefully))
another thought - what gun ???
reason I ask is that some guns SRC JG plus a few others have that horrible 10mm alloy spring retainer clip in piston
(bloody heavy things too)
that mofo will add on a bit to spring compression - a piston tooth is 3mm so that could be like compressing spring 3 more teeth than a bare piston
In reality I'd say over half of pistons have a bearing/spacer of about 5mm inside
G&G's have a 5mm plastic spacer in them - same extra compression as a piston bearing but lighter and less prone to coming undone
(loctite threadlock is best but if you forget you will learn the hard way after a few thousand rounds)
If it has that funny alloy spring retainer spacer clip thingy bollox - then the spring will be hooked into the piston
and may need to strip piston head off to get the sod out - chuck it
then with no spacer in piston m105 me thinks should be fine and not over
AoE should be done and if down a bit add bearing spring guide
Alas this crap I'm suggesting is at very best just a guess - until you open her up you won't have much of a clue what is in there
could be a m110 hooked onto piston with alloy spring thingy
could be a very short gun with m120
TaiwanGun / Gunfire ???
m100 to m105 and perhaps bearing spring guide if needed after AoE
if piston was full metal rack you could short stroke it a couple of teeth
this is only for sad speed freaks tbh - remove 2 teeth & AoE corrected might do the job
(can't reall short stroke full cylinder guns like ak's but medium length barrel guns can be SS carefully bit by bit)
but tbh get a m100 spring is probably quickest & easiest all round solution rather that cut off teeth n crap
(I screwed up first time around so I don't advise this - get a lower spring - job done (hopefully))
another thought - what gun ???
reason I ask is that some guns SRC JG plus a few others have that horrible 10mm alloy spring retainer clip in piston
(bloody heavy things too)
that mofo will add on a bit to spring compression - a piston tooth is 3mm so that could be like compressing spring 3 more teeth than a bare piston
In reality I'd say over half of pistons have a bearing/spacer of about 5mm inside
G&G's have a 5mm plastic spacer in them - same extra compression as a piston bearing but lighter and less prone to coming undone
(loctite threadlock is best but if you forget you will learn the hard way after a few thousand rounds)
If it has that funny alloy spring retainer spacer clip thingy bollox - then the spring will be hooked into the piston
and may need to strip piston head off to get the sod out - chuck it
then with no spacer in piston m105 me thinks should be fine and not over
AoE should be done and if down a bit add bearing spring guide
Alas this crap I'm suggesting is at very best just a guess - until you open her up you won't have much of a clue what is in there
could be a m110 hooked onto piston with alloy spring thingy
could be a very short gun with m120
TaiwanGun / Gunfire ???
m100 to m105 and perhaps bearing spring guide if needed after AoE
Last edited by a moderator:
Sitting Duck
Supporters
- May 11, 2014
- 4,894
- 1,735
Might be a quick change spring which would be a right touch tbh
Sitting Duck
Supporters
- May 11, 2014
- 4,894
- 1,735
Guarder SP's are reported to be 30fps more than other makes of springs
http://www.airsoftsniperforum.com/43-longrange-aegs/6447-list-springs-vs-fps-output.html
SHS's are more expected output spring but Guarder ones have been know to be a bit out on the rating
as for % rating - nah I give up on those ans stick with shs
or do a test comparison with a aps uar quick change aeg now
also to add even more stuff - irregular springs - tight coils at one end of spring...
if fitted incorrectly give out lower than expected results
oh yeah piece of cake this expected fps guessing malarky
http://www.airsoftsniperforum.com/43-longrange-aegs/6447-list-springs-vs-fps-output.html
SHS's are more expected output spring but Guarder ones have been know to be a bit out on the rating
as for % rating - nah I give up on those ans stick with shs
or do a test comparison with a aps uar quick change aeg now
also to add even more stuff - irregular springs - tight coils at one end of spring...
if fitted incorrectly give out lower than expected results
oh yeah piece of cake this expected fps guessing malarky
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