How much gas do i need for a gbbr

[shatis]

I was wondering how much gas canisters i need for a full day and half day of skirmishing if i use a gbbr and a gbb pistol. i just recently bought a gbbr

[BigStew]

What GBBR, what Mag size, how many mags, how many shots do you tend to fire?

[Galvatron]

As BigStew implied, gas consumption is a big variable with GBBRs compared to battery consumption in AEGs.

 

Ambient temperatures will also affect how much gas you'll use, not just the individual GBBR you use and how trigger-happy you are with it.

[EDcase]

Most sites have a shop to buy extras.

[shatis]

2 hours ago, BigStew said:

What GBBR, what Mag size, how many mags, how many shots do you tend to fire?

its a tokyo marui mws i currently have 5 mags gonna get 6 when its time to play. im normaly trigger happy but i will try to pick my shots with this one haha

1 hour ago, EDcase said:

Most sites have a shop to buy extras.

ahh ok thats fine then

 

[Decp369]

It’s really not as much as you think. 
 

with a gas rifle you tend to pick your shots much better & don’t just start blasting everything ( or at least everyone I know does) 

 

I have a MWS with 5 mags & also done the mag mod so they hold way more gas now. 

a can of gas usually lasts me two full days that’s with picking my shots though 

 

you can also use propane gas buying a large canister that you run a BBQ off then fill up a smaller size bottle (to fill off the big one ) then fill your mags from it. The initial outlay for the large one is a lot but the saving are massive over the long run

 

[Cannonfodder]

I'd be very surprised if anyone went through more than a large can in 1 day 

[CrackCommandoUnit1972]

I always take two cans. One is more than enough, but you never know.

 

 

[MistakenMexican]

I played a full game day today. Including venting the mags and refilling them, I used one large can of Nuprol 2.0. So about £8-9 worth of gas.

 

I can’t remember the last time I used more than 1 can.

[DanBow]

On 05/04/2025 at 06:50, Decp369 said:

I have a MWS with 5 mags & also done the mag mod so they hold way more gas now. 

 

What mod? Is that MWS specific?

 

12 hours ago, MistakenMexican said:

Including venting the mags and refilling them

I saw a lad doing this but didn't understand his reasons why, so, why do you vent just to refill?

[Decp369]

13 minutes ago, DanBow said:

 

What mod? Is that MWS specific?

 

I saw a lad doing this but didn't understand his reasons why, so, why do you vent just to refill?

 

they have a fill valve in them that only allows you to fill them so much. I’ll like the video now but basically they hold well more gas, I know you can do it with tm mp7 mags not sure what others you can do it on 

 

 

[heroshark]

I run an Mws and a tm pistol. I take my current open can and a fresh one. I've never used a whole can in a day.

Edited Monday at 07:22 by heroshark

[The_Lord_Poncho]

Re. Venting the mags, the only reasoning that seems to make sense is that by venting them you are forcing a cool down of the mag thereby setting up a decent pressure differential between the can and the mag, and helping you fit more gas in.

[DanBow]

35 minutes ago, The_Lord_Poncho said:

Re. Venting the mags, the only reasoning that seems to make sense is that by venting them you are forcing a cool down of the mag thereby setting up a decent pressure differential between the can and the mag, and helping you fit more gas in.

 

I sort of see the logic but it seems like a massive waste of gas.

[Enid_Puceflange]

I keep JUST my mags in the car the night before game day

They are suitably cold by the time I arrive on site to fill them up, saves venting them

Ive also never used more than 3/4 of a can on a game day

[Tommikka]

6 hours ago, The_Lord_Poncho said:

Re. Venting the mags, the only reasoning that seems to make sense is that by venting them you are forcing a cool down of the mag thereby setting up a decent pressure differential between the can and the mag, and helping you fit more gas in.

 

5 hours ago, DanBow said:

 

I sort of see the logic but it seems like a massive waste of gas.

It depends - how much of fills are filled and used vs vented to chill and liquify etc

 

 

I’m not too familiar with the science of airsoft gases, but with CO2 the ‘right way’ to fill was to expel some to chill the playing cylinder.  
This aided the CO2 filling at its liquid state, and would give an almost ‘known’ baseline

The correct way was to also fill by weight, therefore expelling the current fill and being able to weigh the ‘empty’ cylinder (that’s what the ‘tare’ button on scales is for - to zero at the ‘unladen’ weight’)   Once the cylinder is ‘empty’ you would then fill with chilled liquid co2 to the design weight 

 

But practice soon changes - the cylinders on a site would be at a known (or assumed) weight, and if you chill with a quick purge then fill to the combined known weight - or just fill for a rough burst of time - (what could go wrong at a rental site when just dropping in some co2 between each game ?)

The fill staff would of course be operating a properly designed co2 fill station with appropriate protective gloves and eye wear.

 

At least with HPA there are pressure gauges and the correct burst disks ….

 

 

I did see recently about a mod on cutting down the valve stem inside a magazine based on the theory that a fill stops when the fill gets up to the end of the stem.  So a long stem would only get about 1/3d of the magazines internal capacity, and a shorter stem would give more.

My thought was - why not tip the magazine so the long stem was high up, the gas goes in, liquifies, and doesn’t ’fill over’ the end of the long stem?

 

 

 

 

[The_Lord_Poncho]

16 hours ago, DanBow said:

 

I sort of see the logic but it seems like a massive waste of gas.

Agreed, I never do it. Only thing that I do to set up a differential is stick an almost empty gas can on a radiator or in a pan of warm water to squuze the last if its gas out, or put a hand warmer in an insulated flask bag with the gas can on a very cold day.

[heroshark]

I've never vented them or even empty of gas and bbs at the end of a game day. On the day I just top up all my mags between games. Never gassed out on a mag in game. Note these are all new gen tms. 

Edited Wednesday at 07:26 by heroshark

[DanBow]

13 hours ago, Tommikka said:

I did see recently about a mod on cutting down the valve stem inside a magazine based on the theory that a fill stops when the fill gets up to the end of the stem.  So a long stem would only get about 1/3d of the magazines internal capacity, and a shorter stem would give more.

My thought was - why not tip the magazine so the long stem was high up, the gas goes in, liquifies, and doesn’t ’fill over’ the end of the long stem?

 

I saw this too and had the same thought but doesn't the filling canister need to upside down so you are filling the mag with liquid and not just gas, which would happen if the can is the "right way" up.

[Tommikka]

1 hour ago, DanBow said:

 

I saw this too and had the same thought but doesn't the filling canister need to upside down so you are filling the mag with liquid and not just gas, which would happen if the can is the "right way" up.

Good thoughts … and may bring back to the method and process depending on the type of and physics of the gas concerned ….. shaking, chilling, purging, single step, multi step fill etc

 

 

We need an airsofting data geek to conduct some research on the number of shots per fill when conducted in each direction, purged / unpurged etc

 

(I bet that someone has - and I also bet that there are different people who have done so with varying results !)

 

 

In real life however, a cylinder probably lasts numerous games and each player probably gets the number of shots they need between games and fills and the specifics of the best / good enough fill become irrelevant to all but the most geeky

[Waven]

On 04/04/2025 at 21:37, shatis said:

I was wondering how much gas canisters i need for a full day and half day of skirmishing if i use a gbbr and a gbb pistol. i just recently bought a gbbr

MWS system GBBR + pistol(barely needed to be drawn), 2 bottle of ASG green gas can get me through three 3-4 hrs cqb sessions

But my habit is mostly just single tap, I almost never finish 3 magazines in one 15-30min session

On 07/04/2025 at 08:08, Decp369 said:

 

they have a fill valve in them that only allows you to fill them so much. I’ll like the video now but basically they hold well more gas, I know you can do it with tm mp7 mags not sure what others you can do it on 

 

 

I believe that design has a reason. Some say thecdesign is to ensure there are some space for the liquid gas to expand, and I think it make sense. Since a magazine only holds 35 rounds there is not much point to put more gas in. 

[Decp369]

2 hours ago, Waven said:

MWS system GBBR + pistol(barely needed to be drawn), 2 bottle of ASG green gas can get me through three 3-4 hrs cqb sessions

But my habit is mostly just single tap, I almost never finish 3 magazines in one 15-30min session

I believe that design has a reason. Some say thecdesign is to ensure there are some space for the liquid gas to expand, and I think it make sense. Since a magazine only holds 35 rounds there is not much point to put more gas in. 

 

Loads of people who have done it & never run into any issues including myself so everything seems to be fine. 
 

Its well better having more gas in a magazine. On a skirmish might go through all my mags. If I reload them without refilling gas might not get another mag out of it. 
 

with the gas mags modded I can get at least 70 rounds per mag without refilling the gas