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Classic Army M4 310FPS vs 390FPS?

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Old May 19th, 2009, 22:48   #1
turok_t
 
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Classic Army M4 310FPS vs 390FPS?

Hey guys, ive been researching on some of the CA M15A4 RIS and some sites report that it fires at 310fps, but others says it fires at 390fps. Im just awaiting for my CA M15A4 RIS Crane Stock and i wanted to know its FPS before it arrives. Thanks
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Old May 19th, 2009, 22:52   #2
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I've seen some shoot at sub-200 fps out of the box.

A chrono is your friend.
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Old May 19th, 2009, 23:15   #3
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Originally Posted by mcguyver View Post
I've seen some shoot at sub-200 fps out of the box.

A chrono is your friend.
I know this is a newb question, but what is a chrono? Is this a new spring?

If I wanted to increase my FPS of my gun, what do i need to buy, and will it damage the other components of the gun? Im aiming for 370-390fps.
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Old May 19th, 2009, 23:16   #4
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Chronograph, a tool to mesure speed of projectiles
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Old May 19th, 2009, 23:17   #5
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A chronograph counts the time interval between sensor engagements. Basically, it tells you the velocity of the BB your gun just shot.

A stronger spring would help. M110-M120 is the range you are looking for.
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Old May 19th, 2009, 23:19   #6
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A chrono is a device that measures how fast something is traveling, and you can always use a popcan to test to. Just put a m110 spring in your gun and that should bring you up to your desired fps area.
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Old May 19th, 2009, 23:27   #7
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oh man, i feel like such a newwb :banghead: I can see many ASC members covering their mouths and laughing at turok! But, at least i know the answer now.. I was thinking about getting a Systema M110 or M120 spring from Velocity Arms so i get between 380-392FPS.. if i do, will it damage the internal components of the gun?? Is it also hard to change the spring?
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Old May 20th, 2009, 00:25   #8
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Quote:
Originally Posted by turok_t View Post
oh man, i feel like such a newwb :banghead: I can see many ASC members covering their mouths and laughing at turok! But, at least i know the answer now.. I was thinking about getting a Systema M110 or M120 spring from Velocity Arms so i get between 380-392FPS.. if i do, will it damage the internal components of the gun?? Is it also hard to change the spring?
This site has lots of videos on how to work on mechboxes including changing springs. A more powerful spring will be harder on the internals and so they will wear faster. Nothing some upgrades and preventative maintenance won't take care of. I'm sure some of the more experience members can give you more details. ^^
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Old May 20th, 2009, 00:42   #9
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Quote:
Originally Posted by turok_t View Post
oh man, i feel like such a newwb :banghead: I can see many ASC members covering their mouths and laughing at turok! But, at least i know the answer now.. I was thinking about getting a Systema M110 or M120 spring from Velocity Arms so i get between 380-392FPS.. if i do, will it damage the internal components of the gun?? Is it also hard to change the spring?
I'd reccomend taking 2 seconds to try google next time, haha.
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Old May 20th, 2009, 09:37   #10
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I'm sure if you guys didn't abbreviate chronograph to chrono or chrony he'd have understood...too much L33t speak these days...LOL

Most stock NIB CA M15's that I've seen are 320-330'ish...

Aim for a M110...your battery and motor will thank you in the long run. That might put you into the 380-mid 390 range.

I'm 50/50 on the yellow CA piston...I've seen several that have had tons of use and still look brand new...others crack/chip/fail with little use. Hit and miss I guess.

Definitely reshim, regrease, check that your nozzle is sealing well, check the piston head o-ring. Other than that, you're good to go.

Note: If it's a "well-loved" older rifle...it's best to go over it carefully to catch any weird issues.
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Old May 21st, 2009, 12:26   #11
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Thanks for all your wonderful replies. Im planning on getting the Systema M110 spring to err on the safety side. Will my CA M15A4 stock internals take a beating from this spring?? Im not sure how to change the other internals yet, but im hoping to learn at a later date
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