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All Springer/NP/PCP Air Gun Discussion General > Show Off Your Air Guns With Mods (SHOW and TELL)

45 caliber Big Bird Big Bore Build

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BigBird:
Burning the midnight oil.  Maybe I can get this done for this deer season?

The original small portion of muzzle that remained had to come off so I could put the barrel through the 22mm spindle hole.  I didnt want to just lop 1/2" to 3/4" off so I inserted some random soft round rod (from a power wheels axle IIRC) that must have been 3/8" or maybe metric cause it fit perfect with some plastic around it.  I drilled and tapped a 8-32 in the front of the barrel (the non rifled - bullet starter portion) into the rod and then cut the screw off (so I could use the carbide cutter to cut through it without the head hitting the bit).  Chucked it into the lathe and turned down the muzzle to about 0.78 then cut the screw portion off.  It wasnt concentric (big kids on the Power Wheels) but it didnt matter because now it fit through the spindle hole.  So I put it through and worked on the muzzle and turned it down "all concentric like".  It still needs some final finish but it should be much easier from here on out.

Lopped off portion (cut through tapped threads) on top of native muzzle. Not to be confused with the original front sight hole (further back from the end of the muzzle). It only amounted to about 1/8" and the portion that was not rifled.
, to be removed anyway.


Muzzle looking almost finished

Mark Davis:

--- Quote from: BigBird on August 21, 2019, 01:09:30 PM ---So, based upon all the feedback and suggestions I ordered a 4130 - Round DOM Tube 1.125" x .083" x 36"
with 24" of 1144 and some other a513 tubes for my 30 caliber and future projects.

--- End quote ---
Are you using the 1144 for end caps?

BigBird:

--- Quote from: Mark Davis on August 24, 2019, 08:53:46 PM ---
--- Quote from: BigBird on August 21, 2019, 01:09:30 PM ---So, based upon all the feedback and suggestions I ordered a 4130 - Round DOM Tube 1.125" x .083" x 36"
with 24" of 1144 and some other a513 tubes for my 30 caliber and future projects.

--- End quote ---
Are you using the 1144 for end caps?

--- End quote ---

I may use it for end caps.  I read that Bob used it for a valve and was hoping to do that as well.  It has a good machinability score and strength.  Not sure about how it polishes for making a good seal.
 Otherwise my 1.25"  303 SS is available but it is hard to work with with my makeshift lathe motor and there is a lot of diameter to take off.  I am open for suggestions.

I went through some worry about the barrel when I couldnt find my center.  Every way I put it, it would wobble.  Somehow it worked and it was turning fine.  I reduced the breech side down and now it is just file work to get it smooth and to make sure the profile looks good.  I found some USA made used files for $1 a piece and bought 10!!! Oh man do they work nice compared to dull HF from the bad parts of China.  I have fine and coarse now and I can get it real smooth before sanding.

Difficult to do work in a black hole but then you'd see my "visual organisational skills".  I have no time for clean up and work in a small space  ;)

BigBird:
Previous to last picture.
I had to turn down the breech side barrel which included this welded area for the front stock/cleaning rod lug.

Also in reply to Mark Davis because you may have implied a different question....

--- Quote from: Mark Davis on August 24, 2019, 08:53:46 PM ---Are you using the 1144 for end caps?

--- End quote ---

Yeah, it is less than the diameter of the tube but who said all endcaps need to be tube diameter?  Check out "Bontrager" big bore.  Ill probably use a large screw for the rear end cap if it will work but the front will be a little better steel like 1144 or 303.

BigBird:
UPS said yesterday but got lost or something but finally delivered tubes and a 1144 rod today.  Here is the barrel (&1/2 of breech) on top of the tube.  The 1" x .083 steel a513 looks like a very good size for the project too.  There is a 7/8" x .065 x 24" as well.  I'll have some on hand anyway.

Finger shows the end of the breech at about 31" for the tube size.
Stock is the take-off from my 1917 Enfield.  I'd have to fill a couple holes in the stock (doable) if I used that but it gives a little perspective.


Finished barrel (need to work on the breech part to attach the rest of the breech)

Breech attachment (hopefully what I was thinking anyway...)


Barrel weight

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