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Discussion Starter · #1 ·
hi guys

i want to take my stock marui vsr pro sniper at 600fps.
i buy these parts:
- laylax pss10 zero trigger kit
- laylax pss10 spring guide
- laylax pss10 170sp spring
- deepfire 6.02, 430mm inner barrel
- deepfire barrel spacer

i mount them all and i found the laylax piston oring don't make a good air seal in the cylinder, so i use the stock piston oring on laylax piston and i have a good seal. i shoot, but i only have an average 330 fps with 0,25. I check it again but i don't have air leak. have i to remove the air brake from the piston to reach high speed???
I check the sping after two day of use, and i found the spring about an inch shorter then out of the box, and a little bend.
is this normal?
please help me
:'(
 

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The airbrake doesn't account for 380-400 fps with a sp170 and 6.02 barrel. You have air leak SOMEWHERE, dude. How are you testing for it?

And yes, it's normal for the spring to compress an inch or so and bend initially. This is you "breaking the spring in". You'll notice a slight fps loss as well, maybe 10-20 fps. But the sp170 should still settle in at 550 fps with good airseal. With perfect airseal I know people have their rifles shooting almost 700 fps with .2's.

Possible ways for the air to leak: at the barrel bucking seal, at the threads of the cylinder head where it attaches to the cylinder body, or at the nozzle/bucking seal. There are really weird ways it can happen, but those are the common ones.
 

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Look for a leak near the hop up bucking, I solver mine initially with teflon tape then I installed Noobie's antiblow by rings. I would take another look at the piston O ring. Number 14 O ring from your local home improvement center work as replacements, cost about $2 for a pack or 10. Did you Teflon tape the threads on your cylinder? A lot of players overlook that, it could be a source of the air leak.

I like that you are adding barrel spaces in your build, that will aid in consistency a good bit by supporting your tight bore inner barrel.
 
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