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Self contained airsoft, pump action.

Posted: Fri Mar 13, 2020 6:25 pm
by farcticox1
Experimenting with a self contained pump action airsoft using an air cylinder and springs to provide the power. Using a 1 1/16" bore X 2 " stroke cylinder.
m_a17020dp.jpg
m_a17020dp.jpg (3.18 KiB) Viewed 2894 times
Cylinder is on the top and facing forward which means it needs to be pushed forward to compress springs rather than backwards. Will be self loading if I can make it work, FPS is not critical as I want to use it indoors :D
Pump 1.jpg
Pump 1.jpg (19.22 KiB) Viewed 2894 times

Re: Self contained airsoft, pump action.

Posted: Fri Mar 13, 2020 9:24 pm
by Xamllew
Neat idea to have the cylinder compress forward instead of back, I've seen this in Nerf guns but never an airsoft. Seems like it would be good for a compact bullpup as you seem to have.

Re: Self contained airsoft, pump action.

Posted: Sat Mar 14, 2020 11:25 am
by farcticox1
If this one works I plan on building another with double the size cylinder and barrel, probably forward facing cylinder as well for the compactness.

Re: Self contained airsoft, pump action.

Posted: Sun Mar 15, 2020 9:03 am
by jackssmirkingrevenge
Xamllew wrote:
Fri Mar 13, 2020 9:24 pm
Neat idea to have the cylinder compress forward instead of back, I've seen this in Nerf guns but never an airsoft. Seems like it would be good for a compact bullpup as you seem to have.
The original version of the Silverback SRS A1 cocked the piston on the forward stroke but most users didn't like it, they came out with a conventional rear cocking piston conversion kit shortly after and eventually phased out forward cocking altogether.

Re: Self contained airsoft, pump action.

Posted: Sun Mar 15, 2020 3:10 pm
by farcticox1
the only benefit I can see from the forward cocking is it would give rearward recoil effect :D

Re: Self contained airsoft, pump action.

Posted: Sat Mar 21, 2020 7:14 pm
by farcticox1
A bit of progress, bracket in the middle is for the grip, sprig guide needs a locking collar for the charge handle to push on, trigger not figured out yet or linkage to rear to load.
pump.jpg

Re: Self contained airsoft, pump action.

Posted: Tue Mar 24, 2020 5:57 pm
by farcticox1
trigger mechanism working with light springs on.
trigger (2).jpg
trigger (3).jpg
trigger (1).jpg

Re: Self contained airsoft, pump action.

Posted: Wed Mar 25, 2020 9:00 am
by hectmarr
Its construction looks excellent. Is it made of aluminum? or is it brass?
It looks like a super weapon for the house. Very good work!

Re: Self contained airsoft, pump action.

Posted: Wed Mar 25, 2020 4:39 pm
by farcticox1
pretty much all stainless steel

Re: Self contained airsoft, pump action.

Posted: Thu Mar 26, 2020 6:41 pm
by farcticox1
Got a real trigger made, pull is really light. Had to braze the springs together as the ends were binding on the guide as they moved, have 2 lengths to try.
trigger.jpg

Re: Self contained airsoft, pump action.

Posted: Sat Mar 28, 2020 9:27 am
by farcticox1
Grip made from 3/4" plywood.
grip (1).jpg
Trigger latch needed a bit of a detent to keep it latched
grip (2).jpg

Re: Self contained airsoft, pump action.

Posted: Fri Apr 03, 2020 5:24 pm
by farcticox1
More done, linkage from charge handle to rear to be made and trigger needs a return spring, power seems low but that's what I wanted. The springs are about as much as I can push, rearward charging is definitely needed for more spring tension.
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Re: Self contained airsoft, pump action.

Posted: Tue Apr 07, 2020 6:26 pm
by farcticox1
A few tweaks and it's ready to go back together again, just the connecting rod to make from the charge handle to the loading arm at the rear.
parts.jpg

Re: Self contained airsoft, pump action.

Posted: Thu Apr 09, 2020 8:49 am
by hectmarr
You see a very good construction, (as always, in your projects). It is nice to see someone who has and carries out a project from these sides. I congratulate you, and I look forward to new things from you. :D
 

Re: Self contained airsoft, pump action.

Posted: Fri Apr 10, 2020 2:15 pm
by farcticox1
Trying to make a different/better system for the spring charge/loading handle, this looks much better than the sliding handle I had at the front. The handle would jam very easy because it was trying to twist as it was sliding, the new handle takes much less effort and will be more compact. Still a work in progress :idea:
charge.jpg