Spring help for CA M15A4

[codfish25]

I just want to improve the velocity on my CA M15A4 by only up grading the spring. I wanted to know if anyone could tell me what Systema spring i could get for it without a risk of damaging any parts of the gun.( Highest FPS spring) I would also like to confirm that changing the spring will not affect the accuracy of the rifle.

[Styrak]

A good target is about is about 380fps.
No it should not affect the accuracy of your rifle. You'll get better effective range though.

[codfish25]

Alright thanks alot.
So a Systema M110 would work just fine?

[lemegacool]

look a this http://www.airsoftcanada.com/SpringChart.php

to answer the question : yes it should put you around 380 fps

[Styrak]

Originally Posted by codfish25

Alright thanks alot.
So a Systema M110 would work just fine?

Systema doesn't make an M110.

And that chart should only be used to compare spring vs spring, not FPS you will definitely get with a spring.

[lemegacool]

oh well i learned something! (i only buy prometheus springs), then go with a prometheus ms110

no the chart will not tell the DEFINITE fps you'll get but it gives a pretty good idea (for someone who have no idea)

[turok_t]

if codfish only changes the spring on his CA M15A4 to a SP110 (380fps), will it place too much stress on his gearbox and internals?

[codfish25]

I saw the spring here:
http://velocityarms.ca/index.php?mai...roducts_id=134

[codfish25]

Originally Posted by turok_t

if codfish only changes the spring on his CA M15A4 to a SP110 (380fps), will it place too much stress on his gearbox and internals?

I would like someone to tell me if there would be any risk of damaging the gun by changing only the spring. Thanks.

[m102404]

Short answer is yes, you risk damaging your mechbox by just changing out the spring. Obviously running a stiffer spring will result in greater forces at play in the mechbox. Motor will have to work harder, gears will take on more stress pulling back the piston, piston body will take on more stress, impact of the piston head on the mechbox will be greater. Not rocket science.

I'm not going to rewrite a bunch of stuff that's already been posted in this forum...but here's a couple of highlights to get you started and I've underlined a couple of terms/things to search for. The upgrading FAQs are great places to start...so you understand what changes what.

If you want to skip all the reading and research...just swap the spring to a M100 or M110 (different manufacturers use different terminology...SP, S, M, etc.....go look that up yourself). You'll end up in the 360-400 range. How long it lasts if a combination of how well the mechbox is setup, the quality of the internal parts and just plain dumb luck.

If you want the most durability that you can get, carefully reshim (look that up yourself) the gears.

If you want to "hedge your bets" against parts failure...some would say consider swapping out the stock CA piston. They have a reputation (deserved or not) of failing. Again...go look that up yourself.

Others would recommend testing compression while you've got the mechbox apart.

If you don't want to do all the homework, but want things setup as best as possible...find a gun doc and pay to have them do it. Most of the time it's cheaper and quicker in the long run vs. crapping out your rifle and then having to get someone else to fix it.

Best of luck,

Tys