Need some advice...

I have a Yong Heng pump that I have had for about a year. I have had really good luck with mine filling my FX crown directly. Usually takes just a few minutes to get back to 250 bar. I now have a Brocock Bantum in .25. Since you cant remove this bottle, I need a small tank that I can refill the gun in the field with (One Fill back to 250 would be fine with me.) I would like to be able to fill this small tank with my Yong Heng without running it for a long time. I think these pumps will last a long time if you don't run them to the max all the time. Can you guys suggest something that I can use? Thanks for the help!
 
Lss152 , i also use a YH with a 30 minute tank. Less use of yh and always a supply of air. Bag on Amazon for $25 bucks. Works for me.
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Kind of a bit small but might werq for one complete fill and a partial fill or two. You need to pay special attention to the threads on your tank and the fill unit you have they can be 5/8x18 very common in the paintball industry on the smallish tanks, 7/8x14 or 18x1.5 metric most of the Chinese stuff. Sometimes the regs are installed with locktight making it very difficult to remove them.
 
Would a tank like this work? I'm just trying to get a top up after the gun falls below reg pressure. It says its a 68ci 4500 psi. I already have the gauges that would go from the tank to the gun.

https://www.amazon.com/HK-Army-Aerolite-Carbon-Paintball/dp/B07JHLK1K2/ref=pd_rhf_se_p_img_3?_encoding=UTF8&psc=1&refRID=FR31MCA48RX8GANY68PF



Thanks for the help!

Have you tried the fill calculator on AoA's site?

Note that they'll want the capacity of the tank you're interested in in cubic feet of compressed air. Not the cubic inches of fluid volume. 

So with a 100 cubic inch tank holding 18 cubic feet of compressed air at 4500 PSI the 68 cubic inch tank you're considering will hold 12 cubic feet of compressed air at the same PSI. That's what you would plug in to the calculator. 

Not knowing exactly the capacity of your Brocock I'm guessing you could get one fill in the field if you topped off before you dropped to your regulator setting. 

But play with the calculator first. If it were me I'd probably jump up to a 100 cubic inch tank to be safe. 
 
John this is exactly what I was looking for. Thank you for posting that. Do you think they would ship it to the US? I sent them a message.

I'm not John but somebody built one of these using the Acecare 500 cc cylinder & a valve/hose kit off of Ebay. I don't remember how I even found it nor did I bookmark it. But I think you said earlier that you already have a fill assembly so you'd need to make sure it fit.

But isn't your Brocock a bottle rifle? What cc is the bottle? I don't think you'll get a 250 bar fill off of the bottle in the previous link.