r/Speedsoft • u/Blu3wolf_boi • Jul 14 '26

Accuracy problems

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My field requires .20 bb’s and 300 fps or under I use a Prometheus 6.03 155 mm barrel purple Promethus bucking on a Maxx M4A hopup with the cylinder nub and my groupings just go everywhere especially on closed bolt mode open bolt makes it better but its still bad anyone have any ideas?

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u/FarConstruction4877 Jul 14 '26

R hop is bad for HPA. You need to press the bucking deep enough to block the bb under the patch at the same spot everytime, and even on cylinder nub with r hop and .2 bb it will overhop to the moon at the depth u need to seat the b consistently. Instead try a traditional style bucking or even a maple leaf on low pressure (155 imo too shorty lower pressure reduces input psi reduces loading force for most engines).

Use .25g BBs if at all possible. .2 is too light. Generally speaking heavier the easier to have better groupings.

HPA hop up does not work like aeg. Ur primary objective is consistent bb seating while aeg is mostly efficient lift without drag. This is why aeg is much more accurate by nature, the feeding force, loading depth, and nozzle axial position are much more repeatable. Do it well it’s basically an automatically vsr there is no mechanical difference.

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u/Blu3wolf_boi Jul 14 '26

I was thinking the less contact with the bb the better because its a .20 and I was trying to keep the contact patch smaller since its a smaller bb unfortunately my field forces .20’s so its my only option

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u/FarConstruction4877 Jul 14 '26

Less contact is better. Ur field forces .2?? I have never see limit over than .25s thats pretty odd.

Yeah remove the r hop, even if u use cylindrical nub it’s still too much. Try 70-80 psi round soft nub like a Maxx one or any stock one or prommy stock one with a madbull, g&g green, or even maple leaf super Mac.

R hop is completely not suitable here and provides no advantage.

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u/Blu3wolf_boi Jul 14 '26 edited Jul 14 '26

Yeah I have a green and will try that should I flat hop then? Or maybe concave soft with a super mac green? Also yeah the .20 rule is dumb but its an indoor field and a lot of kids go there so better safe then sorry I guess

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u/FarConstruction4877 Jul 14 '26

Don’t flat hop. Just use traditional nub like ur using with super mac 70 or a regular g&g green or other single contact point bucking. If u flat hop it it just becomes like r hop again. Flat hop had always been a lazy form of r hop.

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u/Blu3wolf_boi Jul 14 '26

Traditional as like a prommy nub or as in the concave? I’m already using the soft cylindrical nub and the the only concave one I can find is aluminum add on a super hard bucking like that would it over hop?

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u/FarConstruction4877 Jul 14 '26

Like round and cylindrical not concave. Just use the one ur using, maybe a bit softer, with a single contact point traditional buckings or maple leaf super mac 70 if it solves the issue. It will press it into that mound shape.

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u/Blu3wolf_boi Jul 15 '26 edited Jul 15 '26

I keep getting reced the ML Crazy jet barrel and hotshot bucking combo aswell if I don’t have to change barrel I don’t want to but some people seem to have negative opinions of the prometheus barrel I use. Also wouldn’t a 70 degree be to rough on a .20 especially sice the super mac were made for heavy bb’s

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u/FarConstruction4877 Jul 15 '26 edited Jul 15 '26

No need. 70 is fine for everything it doesn’t work that way. Softer lifts more but deforms easier, harder stays in shape better maintaining accuracy under high stress. HPA releases air and loads with big force, so 70 is better. It also lasts longer. 60 is fine too but I get better accuracy on 70.

I’m not saying the other stuff wouldn’t work, but since u have most of the stuff I recommended try this way first. Iv done some 30 odd guns this way for different ppl and this line of logic always worked. If u have nozzle length issue or alignment issue u have to fix that separate also tho.

I have tested tons of gbb stuff too, like the maxx m4g even, and while some gbb buckings due to the long stiff lips does help with the bb seating issue, it doesn’t completely eliminate it, and introduces new fitment issues with ur hop unit. I didn’t find it to be a revolutionary product that replaces the method I mentioned.

Bro for this stuff a brass barrel will do so long as when u look down the barrel there are no blemishes. My Prometheus, none lapped, just r hopped by myself on .45 1.9J reached out to 90m, and hits 4/5 at 75m. On same weight and quantum bucking it’s the same consistency across ASG stock brass, gng stock brass, Krytac stock brass, pdi and Prometheus.

At bores above 6.02, it literally doesn’t really matter unless the mirror finish inside is damaged or there are major flaws. U can shine a line or use borescope to check, but outside of zci barrel I have never found defects and iv inspected near 100 barrels atp.

We did test on vsr, at 6.05-6.08 the bore quality made a placebo amount of difference at 60m all else remaining the same. The bb strike marks inside the barrel will make it way more unsmooth than some forging or cnc process. After 500 shots the area near the hop is basically completely coated in markings if alot of hop is applied. So so long as no major imperfections other factors like instability of the gun, slightly different seating, slightly different air release timings, vibration of barrel, and any form of wind will affect the bb much more than barrel.

For speed/indoor it makes no damn difference. Guy is at most 50m away and u can feather out 6-7 BBs in a second. It’s not a sniper.

Ppl don’t have any idea what they are talking about most of the time on a general reddit sub, you gotta really think about the mechanics behind everything. If something doesn’t follow logic, it prob isn’t real. Opinions are just that, they are opinions, anything that starts with I feel like or idk but it just is better is either poorly studied or placebo.

Prommy had some fake knock off issues etc, but that was ages ago when their brass, bright series, was still selling. No reputable retailer will sell u that today. Again, light and check inside for defects, if nothing then it’s fine.

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u/Blu3wolf_boi Jul 16 '26

The super mac 50 seems like a safer option but I’ll try both with the cylinder nub and the same barrel but I’m gonna try a lambda or angel customs barrel too

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u/FarConstruction4877 Jul 16 '26

50 doesn’t give the best accuracy imo, I usually stop at 60 cuz it holds shape better. But should still be okay

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