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Author Topic: M120 spring upgrade  (Read 924 times)

Offline DaGunner

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M120 spring upgrade
« on: November 12, 2008, 09:26:02 PM »
Does anyone know what the fps would be average for the average m4 gun with commando length barrel. The gearbox owner said it would be a little more than 400fps is he correct? (i am not doubting him just want to know what you guys think.)
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Offline GnarlyBlakers

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Re: M120 spring upgrade
« Reply #1 on: November 12, 2008, 09:30:02 PM »
yes it will be roughly in the 410-450 range
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Offline deathbydanish

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Re: M120 spring upgrade
« Reply #2 on: November 13, 2008, 12:22:47 PM »
450 sounds a little high for M120.

What weight BBs will you be using? Also are you using a ported cyclinder?

In the past I've had a CA CQB-R with a CA 120 spring and tightbore barrel spit out .20g BBs at 420fps.
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Offline DaGunner

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Re: M120 spring upgrade
« Reply #3 on: November 13, 2008, 03:43:27 PM »
.23 phx bbs but i don't want it to be more than 400fps
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Offline thatoneguy92088

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Re: M120 spring upgrade
« Reply #4 on: November 13, 2008, 04:22:51 PM »
Systema m120 in my A&K/ECHO1 M249 is about 370 with a .2. The rest of the 249 is stock. Prometheus m120 in a CA mp5 about 330 with a .25 (about 370 with .2). The mp5 has an aluminum piston head. If you have average compression, you will be under 400 fps. A tightbore will increase FPS.
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Offline DaGunner

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Re: M120 spring upgrade
« Reply #5 on: November 13, 2008, 08:36:14 PM »
ok thank you so much.  [smilie=armata_pdt_01.gif]
« Last Edit: December 31, 1969, 05:00:00 PM by Guest »
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Piss lightning, sh*t success.
Sweat more in practice, bleed less in battle.
You can not strengthen the weak without weakening the strong. -Abraham Lincoln
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