|11-17-2019, 03:51 AM||#1|
Join Date: Nov 2017
New PDI barrel increased my FPS by 30fps, is this normal?
I replaced my maple leaf crazy jet barrel from a 6.04 x 428mm barrel. To a PDI 6.05 x 430mm.
I bought a new m170 spring and started cutting and testing my fps. 580 to start, after several cuts I hit 540/550 fps. It's same lengh as my current one which I know is 520.
My old fps with an m170 action army spring cut was 517-522. Now it's 540-550.
Is this normal for a wide bore and not TBB? I feel like I just wasted $15 in a spring...
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FPS 513 514 510 512 516
JG Bar 10 parts list build:
AA hop up
ML bucking 70 degrees
ML concave nub
AA zero trigger w/ 90 degree piston
AA m150 spring
AA spring guide
AA cylinder set
AA end cap (required for AA cylinder)
AA bolt handle
Skeee's TDC hop up
BSA Sweet .22
Last edited by plasticnoob; 11-17-2019 at 03:54 AM.
|11-17-2019, 07:09 AM||#2|
05 is not a widebore. Its still classified as a tightbore. (Anything under 08 is tight generally.) ML barrels inner finish is not all that great and the collar could be off some causing interference.
Could also be the spring. The spring could be a little stronger then normal.
Don't underestimate me. I know more than I say, think more than I speak, and notice more than you realize.
|11-17-2019, 07:45 AM||#3|
Join Date: Nov 2013
Location: Mar del Plata, Argentina
Changing the barrel can very well mean 30FPS difference, but I believe the spring is making the difference in this case. Springs are known to settle down with some use, so even if you have cut the new one to the exact same length of the old one, they can produce different FPS.
Instead of guessing, I'd throw in the old spring and check the power there, to have a direct comparison
|11-17-2019, 12:51 PM||#4|
Join Date: Jun 2012
Location: New Zealand
Don't cut too much off of it otherwise when it does shrink, it will bounce around in your cylinder and can cause issues
Live in New Zealand and want Action Army Parts? Check out this thread:
Advanced VSR Sniper Building Guide
Advanced L96 Sniper Upgrade Guide
Choosing the right spring and making it work