Variable pump coaxial

[dajoro]

I present to you all a simple .30 caliber coaxial piston gun with floating o-ring pump and "custom" trigger. My intent with building any air gun is it must be self contained , no co2 or fridge pump. I learned so much here but noticed the lack of pump guns on the files similar to a crossman pistol I've had for years . I do have a very simple trigger system and grip planned out but right now this shoots incredibly well so im showing it !

top view

[Gun Freak]

Looks cool, what kind of pressure can you generate? By the looks of it I would guess 200 psi max...

[Gippeto]

Clever.

Wondering where you found the barrel and how you attached it?

Maybe add a butt of sorts to the pump rod ....

[bravootome]

it looks...nice
if you manage to put 30 bar....it will be perfect !

[dajoro]

apologies for phone photos

Thanks , it takes seven pumps to hit 120 psi. and is very impressive at 10 yards.
30 bar would be overkill in my backyard!
The barrel is brakeline . I just took some 30 cal. slingshot ammo to the auto store , can't remember
the exact size.
Its all high quality epoxy inside , the barrel has about an inch long plug. The pump tube is simply
another inch of epoxy with a tiny hole drilled thru and a silicone (or rubber ) flap screwed on.
Ah, and the pilot trigger is as simple as an o-ring on a gold construction screw poked thru brass end cap
that was drilled out larger than the screw , allowing pilot venting.

[jackssmirkingrevenge]

Its all high quality epoxy inside

Fantastic work, great to see some out-of-the-box thinking and fabrication

[dajoro]

Ha! Thanks jsr , Im always outside-the-box due to being a cheapo ( resourceful ?)
Here's the whole series of pumpers ive got currently. All are coax self contained and fully servicable Both long gun are yes , shrouded mufflers. A 50 cal. and two .25 caliber experiments .

[jackssmirkingrevenge]

Im always outside-the-box due to being a cheapo ( resourceful ?)

This is genuinely almost bringing a tear to my eye, those epoxy endcaps! *sigh*

shrouded mufflers

[suppresses integrally]

I'm really liking the self-contained nature of these creations, it would be a great concept for a cane gun!

For some reason I'm reminded of clide's mini-pump, though the latter being coaxial was more compact.

[dajoro]

Wow , those were confusing me for a second ! Very different design.

[jackssmirkingrevenge]

The execution is different but the concept of a self-contained coaxial is there. Great stuff!