Imagine running a gbbr with 15-20 mags. You'd go through propane tanks like nothing. That's one of the reasons I buy at least 3 or 4 at a time. They go fast. Also, unlike regular gbb mags, gbbr and extended pistol mags like being filled with fuller tanks.

15-20 mags. Jesus. You must weigh a ton on the field.

Who said I was running them all at once? Personally, I don't carry more that 12+1. Most times 8+1 is plenty even with higher ammo capped events. The rest are in the safe zone for quick ammo reloads.

I only have 6 30rd gbbr mags. They feel like a brick strapped to my chest.

For the last couple of games I ran 8 in rig, 4-5 in belt pouch, 1 in gun.

If your load is setup ok you won't really feel the weight...but when they start ending up in a dump pouch, it really starts to drag. I tend to cycle the fulls out of the belt pouch into the rig...the empties into the belt pouch. I've only had to do that in protracted firefights.

On a Flag Raider skirmish day I'll run through all my mags may 4 times (~1600rnds)...that'll kill a fresh full tank of propane. On a milsim I might go through them twice at the most...and the second gassing is really just topping off.

If it's a light CQB/skirmish-fun day...I might just run 5 mags (one in each pouch and one in the gun)....and as Coach said I'll just leave the rest of them ready to go for a quick swap out of empties for fulls.

Do you stick the dump pouch on your vest, or on your waist belt?

on belt, with suspenders

Belt. Vest makes it sit too high. Although okay for dumping, cycling the empties back up to the rig during a lull in the firefight proves to be futile, unless you are very flexible or the vest is too big/long on you.

Also belt worn dump pouches make it easy to drop your rig and run with one or two mags when you're tired.

Edit: my belt is on custom suspenders.

Coleman 1lb tank itself is approx 180g empty. you can measure that from there.

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.

Put it in a bag, quick dip into hot water (less than 3 sec) remove it shake it, so the temperature evens out. Usually that fixes the issue there.

Hard to do at a game...:)

not purchasable so far as I know...

I'm curious-Where can this dohickey be purchased?