Well, to update... I swapped out all my o-rings. One mag actually gave me 28 shots... although the 14 additional firings were dry, using just gas, No BB's.
Which leads me to assume that letting them come up to environment temps from the chill they get when filling is crucial. Also, this tells me that possibly, that If I reloaded the magazine with BB's, for the second round of firing. I possibly would have achieved 2.5 loads or better on that one magazine.
I've yet to be able though to duplicate this with the other magazines and neither with the first one I tested. On a side note.
I am wondering if it is due to my green gas cans are getting low on fuel.
While replacing the o-rings, Part 125a on one mag at the base where the feed spring gets held in place was snapped off. I'm looking into replacing that piece. The butt plate does hold it in place, but I feel that is a recipe for disaster in the long run and I just may replace the magazine.
To add, I am using moondog's o-rings and they do perform well. I had a package from a year ago that had just 4 in it still, So I decided to use them.
I will though replace my supply with the exact same product featured at McMaster Carr
- Part number 9396K102 The price has dropped to $4.93 for a package of 25 o-rings size 002 - That's a lot better than 5$ for 6. I will also be purchasing some Buna-N O-rings and when you guys see me, you can hit me up for some if you need them.... If you need some now I'll gladly mail you some when I get my order. FREE
To help with o-ring replacement woes I'll share this:
I've developed a tool that pops them on with ease and doesn't tear them in any way... It is basically comprised of the long red applicator tip that you can find on any can of WD-40 or Dust-Off canned air. I modified it by cutting away a small portion of the tip leaving it in a half moon shape. With this tip lightly sanded and rubbed out for smoothness, it easily pops on the o-ring with a simple motion without tearing or poking holds that can happen if a needle or toothpick is used. Just press down one side, rotate the piece and pop the other side.
I also think that a plastic propane adapter for airsoft use can be modified just slightly and used to simply pop one on as well.
So, Is my thinking correct? That near empty green gas cans... will take longer to fill a mag and should I have gone through the process a few more times?
My results on the other 3 mags... One didn't even get 9 shots another fired 11 times before piddling out. They didn't do this before the o-ring replacement. I was careful to lubricate the o-ring inside the valve. So I guess that is where I'm at now.
So even though I did achieve the 2.5 + reloads with one test. I haven't been able to duplicate that...
Edited by Brick Stone, 09 August 2012 - 07:11 AM.