I saw a recent video by SG where he put a bottle reg on his HP semi-auto. I’m wondering how this works with the semi-auto? Does the plenum really fill fast enough to keep up with semi-auto action? Or do you have to slow down your rate of fire? I’d ask him on his youtube channel but I’m banned there, lol.
Bottle Reg for AEA HP Carbine?
- Thread starter darylm
- Start date
I have Huma external/bottle regulator and additional Altaros 14cc plenum installed on my AEA HP semi-auto Assassin .25.
At least with that additional plenum, the semi-auto action works perfectly and haven’t had any issues with the cycling etc (even when shooting fast). Only downside with the Huma regulator (and same with the others) is that the maximum regulated output pressure is ~170 bar, which is not enough to get maximum power out from the rifle. But that is probably not an issue for most of the people who want to have it regulated anyways. With the 33.95gr JSBs I get ~46fpe from that 13 inch Assassin barrel.
At least with that additional plenum, the semi-auto action works perfectly and haven’t had any issues with the cycling etc (even when shooting fast). Only downside with the Huma regulator (and same with the others) is that the maximum regulated output pressure is ~170 bar, which is not enough to get maximum power out from the rifle. But that is probably not an issue for most of the people who want to have it regulated anyways. With the 33.95gr JSBs I get ~46fpe from that 13 inch Assassin barrel.
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I'm glad you replied I was considering putting one on mine but I want more power than that.
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Thanks fiv……..I’m not too worried about maxing out the power on mine. Just want the better, more consistent shot count of having a reg on it. I really appreciate the info 
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Did not do that much of testing without the regulator, but you can get at least ~50-51fpe. Of course the power curve is not very flat.
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I have a question: I just bought a HUMA-AIR Bottle Regulator for my AEA HP Carbine Assassin/Backpacker w/ the CF bottle, in .30 Caliber. The HUMA Reg. came set (label on bag) @ 129 BAR. (I have a threshold of 70 – 155 BAR I can use) I went from an average of 730 FPS +/- (w/o the REG.) with JSB .30 Hades-44.75g or Generic eBay-46g Pellets, to 635 FPS +/- when I added the HUMA REG. (?) The AEA HP Carbine already has a generous shot count as is, unregulated. I want to achieve similar power levels (700+ FPS) with a consistent "FLAT" "Power Curve" (more important to me) as opposed to more "Shot COUNT". Any suggestions on the REGULATOR's setting or hammer spring to achieve this? I'm not sure if the AEA HP is hammer adjustable or not (?) Any info or tips would be HIGHLY appreciated! Thanks.
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So even at 170 BAR (which seems to be beyond the recommended max of 155 BAR), that is still not enough to get near MAX power with a Flatter power curve out of the AEA HP Carbine with the HUMA Bottle reg.?
Again, I have the same rifle but in .30 caliber. I get around 730 FPS with 44.8g pellets non-reg. & about 635 FPS w/ HUMA @ 129 BAR.
Also, where can that plenum be purchased and what real benefit are you getting with it. I have no issue with semi-auto function with just the HUMA reg.
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Current generation of the Huma external regulator should go up to 170 bar. At least their website (https://www.huma-air.com/400-500-CC-Bottle-Regulator) says "The Huma-Air Bottle Regulator regulator comes in a wide pressure range of 60-170 bar output covering sub 12 ft/lbs and FAC models.". Seems that their fitting instructions pdf document is a little bit outdated and still has that 155 bar limit (all the pictures etc are also for the older models).
I remember seeing some power curve graphs for these rifles on other forums some time ago and if I recall correctly, the power starts to drop already when you go under 200 bar. When I did my initial setup, I had my regulator initially set to ~165 bar and I got ~43 fpe, with the increase to 170 bar, the power got up to ~46 fpe. So at those pressure levels, you are not at the peak of the power curve and just increasing your regulator pressure you get more power.
About the plenum, not really sure about the actual benefits. Seen some posts on some Facebook groups and other forums about people testing these guns with and without it. Some people were saying that you cannot get maximum power out from the rifle without the extra plenum. So I just decided to "play it safe" and bought it straight away without any testing. I ordered mine directly from Altaros website (https://www.altaros.cz/en/airforce/107-extra-airchamber-for-high-power.html). It will extend your air bottle/regulator combo length about 4.5cm (1.77in)
For me, the power difference between the unregulated 51fpe and the regulated 46fpe is not that big. According to the initial testing, the power curve seems to be really flat with the regulator and I haven't had a single cycling issue with those 33.95gr JSBs (~300 shots). Also with the regulator you can fill your gun up to 250 bar (instead of 230 bar?) without worrying about the semi-auto cycling on higher pressures. So I'll just shoot from 250 bar to 170 bar and refill.
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My unregulated HP TD in 25 shoots 25.4gr pellets at 910 with a power factor of 23 and foot pounds at 46.72. That is with my dial at 1 oclock. At 12 oclock it shoots the 25.4 around 950. I get 30 shots at 3600 psi at the 23-22 pf range with no poa change at 50 yards.
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Thanks for the info fiv. VERY Helpful. These are my results: <attached> The 1st one @ 734 FPS is UNREGULATED / DEFAULT full power. (all tests w/ 46g pellets)
The next 3 are w/ the HUMA Reg. attached at different pressures. I notice I'm getting about 48 FPE with what I thought was 155-160 Reg. pressure from what I noted in the 3rd screen-shot. But, from what your saying ("with the increase to 170 bar, the power got up to ~46 fpe.") - it must be 170+/- BAR it's set at. (?) Also, curious if it will go beyond 170 BAR reliably (e.g. 185+ BAR). The site mentions this at the bottom of the page:
Important safety notes:
These regulators are not suitable for stand alone pressure bottles/buddy bottles.
The maximum working pressure of this model is 250 Bar.
Do not exceed the factory advised fill pressure of your rifle.
Do not exchange the original factory bottle for a higher pressure bottle version.
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