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Ideal Method of FPS Reduction?

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Old October 17th, 2011, 13:18   #1
Bolt
 
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Ideal Method of FPS Reduction?

I purchased my first AEG during the summer months, and now that the season is moving into winter, I need to look for a way to cut the FPS on it.

It's a G&P M4, and (after having an improved hopup installed) is shooting at just under 400 FPS. I see two options:

A.) Spring change
B.) Velocity reducer

I'm not sure which way to lean on this one, as I can think of pros and cons for each. The only reason I'm considering a velocity reducer is that I'm still very green as far as dissassembly goes, but I don't exactly want to be running to someone every time I need a spring changed.

Just thought I'd throw the question out there and gather some opinions.
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Old October 17th, 2011, 13:25   #2
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Spring change, velocity reducers wear out after a short while.
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Old October 17th, 2011, 13:30   #3
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Velocity reducers do not work on full auto, and are not an acceptable means of lowering the velocity. There are many local gun techs who can easily do a spring change for you. If you don't want to do that, you can also change your inner barrel to a shorter one to reduce the velocity. PM me on the MAA boards (Wrath) and I can give you a hand with either. I also go to U of M
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Old October 17th, 2011, 13:33   #4
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Spring change, the velocity reducer doesn't work if you full auto (inherent drawback to the design). Also some places won't allow you to use velocity reducer because of those drawbacks in design, wearing out, and because if you shoot fast enough in semi it also doesn't work.

Hell, I see this as all the more reason to get another gun That said I only got another rifle because one popped up in the classifieds for a great price. So scour those classifieds and see if there's something you like for a cheap price. Have one outdoor gun and have one indoor gun. Either that or pickup a cheapo Kraken Kurz, swap springs to an M90 or SP85 and rock the indoor fields.
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Old October 17th, 2011, 13:40   #5
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Or change your mechbox shell for something that can do quick spring swaps.
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Old October 17th, 2011, 18:46   #6
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"I see this as all the more reason to get another gun"

Don't tempt me. I've spent enough on airsoft for a while. Startup costs aren't kind.

...it doesn't help that I keep seeing very nice things for sale every time I log on here, either. XD

Spring change it is, then. Thank you for the advice, everyone.

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Originally Posted by L473ncy View Post
Spring change, the velocity reducer doesn't work if you full auto (inherent drawback to the design). Also some places won't allow you to use velocity reducer because of those drawbacks in design, wearing out, and because if you shoot fast enough in semi it also doesn't work.

Hell, I see this as all the more reason to get another gun That said I only got another rifle because one popped up in the classifieds for a great price. So scour those classifieds and see if there's something you like for a cheap price. Have one outdoor gun and have one indoor gun. Either that or pickup a cheapo Kraken Kurz, swap springs to an M90 or SP85 and rock the indoor fields.
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Old October 17th, 2011, 19:10   #7
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hehe that and he got something pretty decent to start with, one of the G&P magpul CQB models that came up on the classifieds at a really good price just shortly after he got age verified....its very very very nice....im honestly kinda jealous lol.
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Old October 17th, 2011, 19:34   #8
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By how much are you trying to reduce the FPS?

A shorter inner barrel will reduce the velocity by a bit.

http://www.hrabri.org/barrel-length-effect-on-fps

The first and third gun in that article are almost identical, however the first gun's barrel is 132mm shorter than the third gun's barrel, and the first gun shoots 97fps lower than the first gun.
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Old October 17th, 2011, 19:37   #9
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Actually something I just thought about was the SAT (Soldat Airsoft Taiwan) VVD (Variable Velocity Device). RA-Tech is making one as well so yeah.

Redwolf sells the SAT one for $100 so that might be a viable option and you should be able to relatively easily change the FPS of your rifle so you can play outdoors in summer and indoors in the off season.
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Old October 17th, 2011, 19:45   #10
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http://www.google.ca/search?q=satvvd...w=1360&bih=703
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Old October 17th, 2011, 19:51   #11
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a few people around here were looking at those but are uneasy with the idea of sticking anything other than a cleaning rod down the barrel
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Old October 17th, 2011, 20:12   #12
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a few people around here were looking at those but are uneasy with the idea of sticking anything other than a cleaning rod down the barrel
That was my first thought but why can't you just remover the upper receiver first than adjust right through the nozzle?
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Old October 17th, 2011, 20:58   #13
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Looks to be pretty inconsistent as well....
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Old October 17th, 2011, 22:08   #14
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That was my first thought but why can't you just remover the upper receiver first than adjust right through the nozzle?
Shhhhhh... You could have made that product $$$$$
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Old October 17th, 2011, 22:11   #15
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No heavier bb joke... now's my chance...

Hey, if you use a heavier bb, the you'll reduce the velocity! AHA

but it's a good thing to become familiar with your gun and how it works. It can be frustrating (especially with m14's...), but some other guns are very easy to work on (F2000)
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