Jump to content
vialli

what spring for under 350 fps

Recommended Posts

Hi

i bought cyma cm028 from taiwan gun and its was firing around 370fps,so i bought a guarder sp100 spring thinking that i would drop the fps to below 350 which is the limit at my local site but its now firing at 385 to 390.Apart from the new spring i regreased the piston o ring and the gears (no grease on the gears whatsoever when i opened up the gearbox.So my question is which spring will get me below 350 fps?im thinking a guarder sp90 will still be to powerfull.

Taiwan gun did offer a free downgrade service but i like to do the work myself.

cheers

Share this post


Link to post
Share on other sites

if an M100 gets you 390fps then an M90 should get you 351, yes it is over but not by any margin, you could dial that out with your hop probably!

Share this post


Link to post
Share on other sites

m90 & correct AoE

(AoE will drop 10-15 fps max)

if/when fps drops a smidge in 6months or so then next service fit bearing spring guide

that will put back 10-15fps once she drops to 325 or so

Share this post


Link to post
Share on other sites

Or take the spring out of the ics m4 which is firing around 317 fps and try that and put the sp100 in the ics .got the split gearbox so not a major hassle.

Share this post


Link to post
Share on other sites

Might as well post my stupid question in here seeing as though there is already a thread.

 

My krytac spr shoots around 280fps as it is the UK version. I have googled to hell and back to see what stock spring it has and no dice.

 

I want to take it as close to 350fps as possible but without going over it, now I am under the impression I need an m100 spring...but I may be wrong.

 

Any ideas?

Share this post


Link to post
Share on other sites

Might as well post my stupid question in here seeing as though there is already a thread.

 

My krytac spr shoots around 280fps as it is the UK version. I have googled to hell and back to see what stock spring it has and no dice.

 

I want to take it as close to 350fps as possible but without going over it, now I am under the impression I need an m100 spring...but I may be wrong.

 

Any ideas?

Yeah take it back to the shop. I have had my hands on 5 different krytacs and all of them were averaging around 330fps stock. I thought they were all fitted with m100 springs, reckon yours has an issue.

Share this post


Link to post
Share on other sites

Yeah take it back to the shop. I have had my hands on 5 different krytacs and all of them were averaging around 330fps stock. I thought they were all fitted with m100 springs, reckon yours has an issue.

I am firing 0.25's

 

I bought it from patrolbase and this is what they put in their description and I have read that the UK versions are weaker then the US versions.

 

  • Name Designation: Trident SPR - Dark Earth
  • Manufacturer: KRYTAC
  • Fire Selector: Safe, Semi, Fully Automatic
  • Magazine Capacity: 300 Rounds (Hi-cap)
  • Feet Per Second (FPS): 311fps (Using 0.20g BBs)
  • Powered By: Electric
  • Construction: Full Alloy Construction, with Polymer Stock and Pistol Grip
  • Hop Up: Adjustable behind Dust Cover
  • Length: 84cm - 92cm
  • Height: 22.3cm
  • Weight: 2.7kg

Share this post


Link to post
Share on other sites

311 is lower than the ones I have seen.

If you put up a post saying what fps your gun is firing add your bb weight if not basing it on 0.2g as thats what most people use for a base fps reading.

It will most likely be a m100 try an m110.

You want to chrono it with 0.2 as thats what sites use. 350fps with 0.25g is about 380fps with 0.2g.

Share this post


Link to post
Share on other sites

It's best to e-mail Patrolbase too as they may have swapped it themselves. Krytacs have a quick-change spring so it's feasible for retailers to do that now.

Had two from patrolbase and both were between 320 and 330 if I remember right.

Share this post


Link to post
Share on other sites

Krytacs or other AEGs? No doubt you did but they're even listing it there as 310. Not sure why, but maybe because of a lot of those CQB sites and they're not able to reliably keep it around 325-330? I guess that makes more business sense than people returning their guns because they shoot hot. *shrugs*

Share this post


Link to post
Share on other sites

Oh god how many spring changes have I done in my SPR Krytac over the last few weeks..... lol

 

I do know that an Orga 6.23mm WBB (450mm) combined with an ASG M150 spring will get you pretty much bang on 350 fps,

I do know that a PDI 6.05mm (420mm) combined with an Orga M125 spring will get you 410fps at home, then when on site will bizarrely drop to 335 fps and shoot like a pile of turd for no reason

I do know that if you then swap the upper receiver/barrel for that on a Krytac PDW the fps is 350 on the button and range/accuracy is obscenely good with effectively the only change being barrel length????

 

I'd go with an M100/M110 spring tbh on a standard SPR.

Share this post


Link to post
Share on other sites

Cheers for the help guys, I will look into this.

Share this post


Link to post
Share on other sites

Put in a sp90 and it's bang on 330 fps.Got a feeling that m100 may have been a m110 in a m100 packet.

 

People underestimate just how much of a difference that little bit of grease on the piston o-ring makes. If you had ONLY changed the spring and got the same results then I would be inclined to agree but as you also said that you lubed up one of the major points or airseal then no, I'd say it was an m100 in that m100 packet.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×