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It's sort of both, but there's really no precise measurements.

Presuming you're limited to low power, you will need to create more of a pressure spike by adding weight to your piston, and boost your spring power to as high as you can go while maintaining your joule limit. For hop stuff, as long as your barrel is shiny below the hop window, about any bucking should be fine, but a Maple Leaf 2021, R-hop, or some other buckings will certainly help you along.
 

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Discussion Starter · #4 ·
Consider porting cylinder as well.
What is or what you mean with "porting"?

It's sort of both, but there's really no precise measurements
I was thinking to take a GBBR DMR or BOLT ACTION Sniper replica: my goal is to lift heavier BBs to increase distance first of all.

GBB I know have like an higher "cylinder volume" due the gas: am I right?
 

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If you are going down the gas route porting doesn't apply. For a BASR or AEG, porting will increase the pressure spike Silicon was talking about potentially giving you more hop up ability.

By porting I mean drilling a hole in your cylinder closer to the cylinder head to give your piston time to accelerate before it seals, "punching" the bb out as opposed to sealing early and "pushing" the bb out.
 

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Without porting, your piston will compress the air immediately, making your BB moves right away. With porting, your piston won't compress after it has moved a certain distance, meaning the piston has more speed when it finally compress the air and pushes the BB out compared to a non ported cylinder.
 

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Discussion Starter · #8 ·
Without porting, your piston will compress the air immediately, making your BB moves right away. With porting, your piston won't compress after it has moved a certain distance, meaning the piston has more speed when it finally compress the air and pushes the BB out compared to a non ported cylinder.
What is porting?
 

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Without porting, your piston will compress the air immediately, making your BB moves right away. With porting, your piston won't compress after it has moved a certain distance, meaning the piston has more speed when it finally compress the air and pushes the BB out compared to a non ported cylinder.
Please do NOT follow this advice if you want to shoot heavier BB effectively.
To lift heavy BB, you need backspin from the hopup and more speed/power.
Heavier BB has more inertia so it will needs more air and barrel length to accelerate to the same speed as lighter BB. Porting the cylinder will reduce your air volume and drop your power significantly. Hope this help
 

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Please do NOT follow this advice if you want to shoot heavier BB effectively.
To lift heavy BB, you need backspin from the hopup and more speed/power.
Heavier BB has more inertia so it will needs more air and barrel length to accelerate to the same speed as lighter BB. Porting the cylinder will reduce your air volume and drop your power significantly. Hope this help
On that point, I am not advicing on porting as I am only saying what porting is and what does it do since he has vague idea about what porting is.
 

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Please do not take porting as advise from me either. The ops original question was "how can I lift heavier bbs". The porting idea is based on the assumption that he has a 1joule limit. Also I the basics have already been suggested by SS and some assumed the op know already (better/grippier bucking, good air seal, ect). Porting was a merely a simple suggestion of one of the few ways to get more hop. I would agree that porting is not the most power efficient setup. Albeit can get you to hop heavier bbs on lower power outputs on AEGs or BASRs. For example, I have a 1joule BASR build (well sr-2) I can hop .43 with a regular nub type bucking (maybe heavier but havn't tried). I would agree that this should be a last attempt with the realization it is an irreversible mod that if you screw it up you will need a new cylinder (so be willing and ready to buy a replacement). I would not advise to do it if there if you can achieve it with simpler solutions or if tools/skills/replacements are limited. Again if he is going down the GBBR route like the op mentioned a little later, this information is al null and void and the little knowledge and experience I have here is get a good quality bucking and use dry gas and lubricate moving part by hand occasionally.

I guess we need more information rather than assume some things as it seems the question has morphed into something more specific.

What are your goals Fonzie?
-Power
-bb weight
-replica power type (BASR, GBBR, ect)
-replica models you like
-do you have the replica already and what have you tried?
-what is your tech experience/tool availability and confidence level?
-budget
 

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Akami did answer the "what is porting" question pretty simple. My other explanation would be how AEG cylinders are ported with the slot in the cylinder to more correctly volume match shorter barrels (and can also increase pressure spike). Porting a bolt action sniper rifle (BASR) is the same concept.
 

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Bigger cylinder = more air volume = more power over time with the proper ammo and barrel.

Ported cylinder = less air volume and room for the piston to accelerate = higher nozzle energy but less energy overall.

Go for the hop rubber upgrade, imo way better than the huge trade off from porting your cylinder.
 

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Discussion Starter · #17 ·
Until now my replica for range shoots was an Ares Striker AS-02 and with that, I reach with straight shootings at 0.99j:
  • 70-80 meters with 0.40g LBS
  • 65-70 meters with 0.30g SPECNA ARMS
I worked a lot on this replica and of course, I'll continue to work to achieve better results but now I want to take also a new replica that can help me achieve my goal to reach far distances more easily.

I always assumed that to reach this goal I should use heavier BBS and I can do that only with a high volume of air in the cylinder: for these reasons I was thinking that my new replica should be a GAS replica because I read that these have like "higher cylinder volume" due to the gas and the power of the gas.
Honestly I don't know if what I've just said is it correct or not because I've never own a GAS replica but if I'm right:

  1. what is the GBBr/GAS replica with "higher cylinder volume"?
  2. What is the GBBr replica that can lift heavier BBs?
To be honest, I'm not searching for silence, I like to create panic in the field so silence goes in the second position.



What are your goals Fonzie?
-Power
-bb weight
-replica power type (BASR, GBBR, ect)
-replica models you like
-do you have the replica already and what have you tried?
-what is your tech experience/tool availability and confidence level?
-budget
  • Power= 0.99J
  • BB weight= Heavier possible
  • Replica power= GAS or Spring
  • M110K1, Tac41 A, MSR 308,
    I like DMR replicas and/or all replicas that can be mounted and dismounted easily (if the replica have not that semi auto I would like to carry the replica in the backpack)
  • I've tried nothing, in past I've only tried a quiet SRS but was modded for silence more than range so it goes like 55 meters
  • I have not experience with gas and with bolt like 5/10 (I'm humble)
  • Less I spend more I'm happy but technically I have not budget limits
 

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Gotcha, that is good info. A semi auto gas gun does sound like the way to go to me as well. Maybe a short SSX303, KJW 10/22, carbine kit for the aap01 then upgrade to a good bucking or r-hop. Then can look at upgrading them to HPA for more power output constancy. I can not give any advise here though as I do not have any significant gas gun experience either.

I would be curious as well to know how easily gas guns can hop heavy bb.s (.40 to .48) at low energy levels (sub 1J).
 

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Hi everybody :)

I was wondering what it's need to lift heavier BBs: is it the volume of the cylinder or the thing that is it important is the hop up only?
Hi whats the biggest spring your allowed to run?
I would go with bolt action and run a 9ball Laylax hop with a TDC.
That's my current set up and it spits them out with fury with awesome distance from a 430mm barrel.
As you know 430mm is the sweet spot, any longer then it becomes counter productive..the whole friction vs resistance comes into it.
 
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