If you're testing/troubleshooting things...make sure you start with a fresh tank of gas...and have enough lube in things. Also make sure that your mags warm back up to room temp before using them (which is a pain if you don't have many mags). I was working on one gas SMG and its mag was ice cold after ripping off a whole mag (to test cycling)...refilling and letting it warm for retesting was a pain in the ass.
I've found that the tanks need to have sufficient liquid propane in them to really fill the gbbr mags properly.
When they get low...I don't find that I get a "good" fill for larger mags.
There tends to still be enough in there to fill pistol mags/grenades....so when the tank gets low I put it aside to use for those. Or to shoot a bit of gas into mags if I'm putting them away for a bit.
I buy 6 at a time...and have a dohicky to lube the tanks themselves so I don't dick around with drops of oil/mag. One of the last game my buddies brought over their tanks and we lubed them all up too. They last for a good bit of time on the gaming schedule I can swing.
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