FX FX Impact M3 1st Reg Deleted 300 bar?

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jezzab

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Oct 11, 2024
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I've got an FX Impact M3 and deleted the first reg with the Huma Air kit and have the high pressure Huma Air second reg.

Things are going great but I have a 700cc 300 bar bottle installed and I've only been filling it to 250 bar.

Would it be ok to fill it to 300 bar? I've read here somewhere that Huma said the reg itself can take it no problem but I'm interested in if the rest of the air rifle can.

The extra shot count would be great if so.
 
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FX seems to say no in most of the literature and direct video info I have seen. The Huma high pressure reg is great but it still has a max working pressure and a max safe pressure. Personally I would not fill past 250Bar with a single reg. I have a 300Bar bottle on my two reg Impact M3 and only fill to 260-270Bar. You dont actually get a whole lot more shots filling up to 300Bar anyway, due to Boyles Law. You get more shot count efficiency just by going to the bigger bottle in my opinion. No need to push things to the extreme for small gains.
 
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From FX Sweden:

M3 Pressure limits:

1. Maximum allowed working pressure at inlet to trigger block is 250 Bar (as printed on the trigger block at bottle pressure gauge). Do NOT exceed.

2. Maximum allowed plenum pressure is 170 Bar. Do NOT exceed.

From my SCUBA training manual:

1. Above 240 Bar you compress less and less volume of air per bar.

2. Increasing tank volume 0.5 liter at 250 bar will give you 3 times more air than raising the same size tank from 250 to 300 bar.
 
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