Modern Full auto PCPs

Building or modifying BB, Airsoft, and Pellet type of guns. Show off your custom designs, find tips and other discussion. Target practice only!
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wyz2285
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Tue Apr 01, 2025 6:08 am

Been a while since I was into PCPs, now I see things like selective fire PCPs shooting pellets instead of just 4.5mm steel BBs.https://www.youtube.com/watch?v=eBvs8Wvu0yg
Is this just iterations of the Huben full auto PCP? Hows the main mechanism work?
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jackssmirkingrevenge
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Tue Apr 01, 2025 8:19 am

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The Mordax is "hammerless", my understanding is that the internals are very close to the Huben
hectmarr wrote:You have to make many weapons, because this field is long and short life
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wyz2285
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Tue Apr 01, 2025 9:31 am

Figured so! I found some animations for the Huben but I'm sure you have a better understanding of it than me? The Huben seems to not have a bolt nor nozzle? Just oring seal on both sides of the mag?
CpTn_lAw wrote: :D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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jackssmirkingrevenge
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Tue Apr 01, 2025 9:44 am

wyz2285 wrote:
Tue Apr 01, 2025 9:31 am
The Huben seems to not have a bolt nor nozzle? Just oring seal on both sides of the mag?
Correct, it fires directly from the magazine. In fact one difference between the Mordax and the Huben is that the former has a removable magazine, reportedly this leads to air loss on firing because it does not seal as well.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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wyz2285
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Tue Apr 01, 2025 9:54 am

Oh so Huben uses a fixed magazine? So much for pellet chambering depth and such. 2k dollars for a plinker lol
Came across your full auto blow back 4.5bb gun on GTA, I suppose that can be refined into a selective fire version with a more complex trigger group. What's the power you were getting? And how many shoots per fill?
CpTn_lAw wrote: :D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Wed Apr 02, 2025 6:10 am

wyz2285 wrote:
Tue Apr 01, 2025 9:54 am
Oh so Huben uses a fixed magazine? So much for pellet chambering depth and such. 2k dollars for a plinker lol
I've seen mixed reports on accuracy, some people are getting good results.
Came across your full auto blow back 4.5bb gun on GTA, I suppose that can be refined into a selective fire version with a more complex trigger group.
Indeed, and if you want something ready-made there are plenty of paintball marker trigger groups that would do the job just fine.
What's the power you were getting? And how many shoots per fill?
I never measured shots per fill but it was certainly more economical with air than a BBMG :D

Velocity was limited to below 500 fps for legal reasons but it was capable of much more. Need to make a larger caliber variation at some point.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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