SBA Vs Rapax Spring testing - Airsoft Sniper Forum
       

Go Back   Airsoft Sniper Forum > The Rifles > Silverback SRS
Like Tree1Likes
  • 1 Post By Milan
Reply
 
LinkBack Thread Tools Display Modes
Old 02-16-2020, 04:06 AM   #1
Young Gun
 
Steveocee's Avatar
 
Join Date: Jan 2019
Location: UK
Posts: 85
SBA Vs Rapax Spring testing

Quick comparison as I couldn't find any information on this so went ahead with buying the spring anyway.

**I am UK based so that means I do work to 500fps/2.32J site limits. I am aware that during testing this was a touch over that however the RIF is stored without a spring and this will be reduced once I get my new barrel and airbrake installed.**

My testing 0.2's are a mixed bag, it does look like there was an inconsistency however all 0.43 testing was a fresh bag of Geoffs Super Precision BB's.
Hop was warmed up with a mag through it before recording results.

All shots fired on a 20" Sport with FAST hop set for 0.43s on it's last outing with SBA 60 bucking and a SBA airbrake piston head with medium brake inserted.

Silverback M150 using 0.2 in fps
470
475.9
476.1
437.5
475
Silverback M150 using 0.43 in fps
348.4
347.9
347.5
346
345.6
Rapax 2J using 0.2 in fps
479.9
476.9
477.2
441.7
476.5
Rapax 2J using 0.43 in fps
345.7
345.4
347.8
348.3
350.1

Other points to mention
The Rapax does feel a bit easier to pull than the SBA M150 which is what it advertises itself as.
The Silverback spring has had 2 game days (read 1000) bolt pulls so is likely better bedded in than the brand new Rapax.
There was no spring twang!
__________________

Last edited by Steveocee; 02-16-2020 at 04:09 AM.
  Reply With Quote
Remove Ads
Old 02-16-2020, 11:41 AM   #2
Advanced Sniper
 
Join Date: Nov 2018
Posts: 830
In my experience both are quality springs. I have SBA M160 and M170 and a Rapax Hulk. The Hulk is honestly about on par with with M170 pull wise but the power is much higher.
  Reply With Quote
Old 02-17-2020, 11:21 AM   #3
Young Gun
 
Steveocee's Avatar
 
Join Date: Jan 2019
Location: UK
Posts: 85
Quote:
Originally Posted by AccurateDMD View Post
In my experience both are quality springs. I have SBA M160 and M170 and a Rapax Hulk. The Hulk is honestly about on par with with M170 pull wise but the power is much higher.
Which to Rapax credit is exactly what the springs are marketed as. I think a part of me was hoping for M160 levels of power output with M140 levels of bolt pull.
I'm striving to run the long airbrake and still make 2.2J with the standard unweighted piston. Guess I'll just end up going VMP if not.
__________________
  Reply With Quote
Sponsored Links
Advertisement
 
Old 02-17-2020, 11:38 AM   #4
Advanced Sniper
 
Join Date: Nov 2018
Posts: 830
I run mine on VSR. I use a WASP with custom cut airbrake. It's quiet, but not SRS quiet. Power output is 4J with .48 though.

For what you're trying to do I think you'll want the weighted piston. Air volume shouldn't be an issue with the SRS even with a brake, but piston weight will change the power output quite dramatically.
  Reply With Quote
Old 02-17-2020, 03:36 PM   #5
Young Gun
 
Steveocee's Avatar
 
Join Date: Jan 2019
Location: UK
Posts: 85
Quote:
Originally Posted by AccurateDMD View Post
I run mine on VSR. I use a WASP with custom cut airbrake. It's quiet, but not SRS quiet. Power output is 4J with .48 though.

For what you're trying to do I think you'll want the weighted piston. Air volume shouldn't be an issue with the SRS even with a brake, but piston weight will change the power output quite dramatically.
You are correct.
Have swapped in the new barrel tonight and fitted the R hop. Perfect seal (as always) but J is lacking a bit although on a 0.2 we're doing pretty well.

Have ordered a VMP to get those Joules up a bit.
__________________
  Reply With Quote
Old 03-15-2020, 05:39 PM   #6
Milan   Milan is offline
Young Gun
 
Milan's Avatar
 
Join Date: Dec 2017
Posts: 49
Hello guys, thank you for using my springs, I try to make them best I can do. Difference from other springs is not just in pull force, but in durability of spring itself. But you will see that in time. For example my 3+ prototype is still in use with 95% of force like when new, and it fired ~15.000 bb's.
2+J was initially made for UK market but it can't perform same in 16" and in 26", 16" would be on spot, but 20-26" will be a bit hot. You can always compensate that with adding longer airbrake or adding sorbo pads to make it quieter and to be on spot with your field limits.
Steveocee likes this.
  Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -5. The time now is 09:53 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
SEO by vBSEO ©2011, Crawlability, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.