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Diablo747

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Reply with quote  #16 
I had similar problems with springs. After two month I had to replace the spring: I had lost 0.12 joules. And now it drops again (0.05 joules).
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Hammer

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Reply with quote  #17 
I as well was getting fading FPS straight out of the box. I ended up using a little cylinder lube that G&P makes in the piston o-ring and the nozzle. It pushed the fps back up and stable but now it's shooting way too hot. Even after 300bbs it's spitting out .20s at 415-420fps
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Letumbuh

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Reply with quote  #18 
My LVOA-S bought from Proairsoftsupplies in the UK faded after just 2 games, the FPS dropped and I had to put in a new spring. Which was a shame as out of the box it came at 349 FPS.

After replacing with a Lonex M100 its been bang on ever since.
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Wild Rice

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Reply with quote  #19 
My LVOA-S stock spring decreased quite a bit, down to about 340FPS with .20g BBs, but I'm told that this is expected if you leave the spring compressed by firing in full auto without firing a few semi shots afterward. Perhaps this is happening to some of the others on this thread.

I've since replaced the spring with a new irregular pitch m120 as well as installed a Prometheus 6.03 inner barrel with a Maple Leaf 75 degree (pink) bucking.

I thought that I would see an increase in FPS but it still shoots about 380FPS with .20g. The chronos used were both the shoot over and shoot through types.

I suspect that there may be a bit of compression lost somewhere with the aftermarket parts - or the mag a "Kilo Mike Alpha" M120 ('cos the forum won't let me spell it just with the letters), but I'm at a loss where to start. Thinking of just increasing to a higher spring unless anyone has some ideas.
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Kraken_Wrangler

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Reply with quote  #20 
Do you still have both the hopup and barrel springs?
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Wild Rice

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Reply with quote  #21 
Yes. I am still using the original hopup unit and both barrel springs. I'm also still using the orange Krytac bucking nub. C-clip also still in good shape.

I originally tried to use a new Krytac orange bucking but I was getting jamming issues. No lubricants were used in the installation and I wiped down the hopup unit which had a bit of oil or something in it which I assume was from factory.

I noticed that the stock barrel had a bit of spring to it when fully inserted into the outer barrel whereas the Prometheus barrel does not. Likely due to the barrel being slightly larger in diameter, perhaps. The new barrel does not get pushed back toward the nozzle like the old one did before the upper is reattached, but also there does not appear to be much play once reassembled.
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Kraken_Wrangler

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Reply with quote  #22 
hmmm... What region are you located in? This forum is international and we ship multiple configurations around the world. So some guns purposefully shoot a lower FPS.

Also, did you get a chance to grease the o-ring at the end of the Prometheus barrel? The diameter should be about the same as ours. We measure at 8.48mm +/- 0.025mm, they produce theirs at 8.5mm. So tolerances should be negligible.
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Wild Rice

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Reply with quote  #23 
I'm in California. Picked up my LVOA-S at Airsoft Extreme in Santa Clara. It shot 395 with .20g BBs out of the box. I can't recall what the hop up was set at though.

I did grease the o-ring that came with the Prometheus barrel using a bit of shock oil. At first, I tried to reuse the Krytac o-ring in the 3rd slot, but no dice. It just wouldn't fit into the outer barrel.

BTW - Absolutely love my LVOA-S and the new barrel has helped to tighten groupings. I just want it to get back to shooting a bit harder.

I'll test FPS consistency later today. Perhaps if there is a big swing, that might help diagnose the issue.
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Kraken_Wrangler

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Reply with quote  #24 
You actually don't need all those o-rings. One is sufficient. I typically use the smallest o-ring at the 3rd slot furthest from the muzzle.  Use a small dab of Silicone Grease (not oil) if you can. Oil will flow out.

if the gun is in more-less stock configuration, minus the aftermarket barrel. Try setting the hopup to #3, then use the original highcap mag to chrono with 0.20g bbs. That's our setting for calibration.

Use an airsoft-specific chronograph as paintball and firearm ones have different calibrations and may not be as accurate. 
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Wild Rice

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Reply with quote  #25 
Thanks. I wiped down the inner barrel and applied a bit of grease then changed up the o-ring as you recommended.

With the irregular pitch spring (Prometheus M120) at a hop up setting of 3 and .2g BBs the FPS stayed about the same as before. I used both the stock mag and also a midcap and there was no noticeable difference in FPS between them.

I chucked in a madbull M120 standard spring and the gun was shooting 450 FPS. Yikes.

I then tried an ASG Elite M125 and I'm now shooting 400 on the dot as measured at AEX and MCSUS. At Fort Ord this past weekend it was measured at 403-405 (with one outlier shot at 414). 

I'm good to go. Now just need to adjust the motor height as my gun sounds a lot more 'breathy' than my buddy's new LVOA-S that the guys at AEX tuned for him. 

Thanks for all your help!
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