Third Homebuilt Gun Of The Winter — DONE! —

I just finished the third (and last) homebuilt gun of this winter.
.25 cal. , 24 inch LW barrel, Extra long shroud.
Extra high scope mount to see over a 4500 psi, 68 cubic inch tank.
Easily makes 1050 FPS with 31 grain Kodiaks.
Home anodised. Homebuilt grips.
Two stage trigger.
Push on / Push off , brass safety button.
Extra strong, threaded on muzzle end plug.
Leapers 50 MM, 16 power, AO scope.

I have not got it out to the woods yet, maybe this weekend.
I still need to work on the trigger pull, its a little heavy, at 6 pounds.
Gotta profile and polish the sear.
I am still learning on the anodising, as you can see.
Cocking action is Smooth!
I should be able to get a lot of high power shots from the BIG tank,

Mark

Mods/Machinists

All Replies

Viewing 9 replies - 1 through 9 (of 9 total)

jezx

Participant

April 21, 2008 at 1:46 am

looks great , all the pictures . nice idea with the grip .

shrpshotr28

Participant

April 21, 2008 at 1:30 am

Look for “in tank regulator” in the quick ref section. Some really good ideas.

mm123522

Participant

April 21, 2008 at 1:22 am

shrpshotr28:

Yah your right! A regulator would capture the additional capacity of the tank. I am not sure I’am up to building the regulator — McMike!!

Mark

shrpshotr28

Participant

April 21, 2008 at 12:57 am

That is awesome. 💡 Now for a valve w/ regulator set to about 2600psi. You could use the full 4500 fill capacity and probably get upwards of 175 full power shots. 😈 😀

Great job.

mm123522

Participant

April 20, 2008 at 11:57 pm

Follow up report.

I been playing with hammer weight. Adjusted the hammer to produce 975 FPS maximum, with 31 grain kodiaks @ 2800 PSI.

Today I filled it to 3200 PSI, and shot two test shots @ about 950 FPS.
Then took it out into the woods and shot another 42 shots.
When I got home I shot another 2 shots @ about 935 FPS.
Checked the pressure and it was 2500 PSI, thats 46 shots @ about 60+ FPE, and only using 700 PSI.
It looks like it will give about 60 full power shots on a fill.

Very quiet at this power level.
Producing 1 inch groups at 50 yards.

Mark

mm123522

Participant

April 13, 2008 at 4:47 pm

Thanks Guys!

The fit, finish, and anodizing turned out good on the trigger housing. If you notice, the trigger guard is a lighter color than the trigger housing. I think my acid and/or dye baths were getting old / used up. The barrel shroud is a dark metalic gray / green. I used the same acid and black RIT dye. The barrel shroud was last to be anodized and it turned out the lightest color.

Put a “hotter” valve on the carbon fiber tank. It sends 31 grain Kodiaks down range at 1150 FPS for 90 FPE. You can hear the supersonic crackk!!Way more power than I need or want!! Was using a 3200 PSI fill – can still go up on the pressure.

More pictures: