GTA

Airguns by Make and Model => Vintage Air Gun Gate => Topic started by: WyoMan on February 11, 2017, 12:25:28 AM

Title: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: WyoMan on February 11, 2017, 12:25:28 AM
First mod was a longer barrel – a 10.5” long cut from a choked LW blank:
(http://i.imgur.com/bPbtlRz.jpg)

Turned the muzzle to .437”:
(http://i.imgur.com/Fe34ICp.jpg)

Then the breech to .374”:
(http://i.imgur.com/itq4UcD.jpg)

The exposed part of the barrel needs to be about .430” for end cap clearance:
(http://i.imgur.com/N9B6CkO.jpg)

The last cut was a freehand taper:
(http://i.imgur.com/grF74uQ.jpg)

Shown with adapter:
(http://i.imgur.com/IumiQJ6.jpg)

The shoulder (.374” to .430”) fits tight to the frame. If the face cut on the breech was cut right, then the feed arm gap to the barrel will be .002” to .003”:
(http://i.imgur.com/ovVMabJ.jpg)

Another pic:
(http://i.imgur.com/w0EtrOj.jpg)

The feed arm gap is ok so I can cut the leade-in next:
(http://i.imgur.com/LNTdJ0h.jpg)

Using this 7 deg rotary fine-cut file:
(http://i.imgur.com/K0inChv.jpg)

The idea is to get it started, but, leave enough to finish cut with sandpaper rolls, rubber polishing bits or your favorite finishing method.
(http://i.imgur.com/QyMtloN.jpg)

Finished with new barrel:
(http://i.imgur.com/0389NeN.jpg)
(http://i.imgur.com/aBkeiEs.jpg)

Next mod was to get some sight aid so I could shoot something better than a 2” group.
Started with some flat dovetail stock and cut off a 4-3/4” long section:
(http://i.imgur.com/XYZ2obl.jpg)

Measured and drilled to use the rear sight screw and barrel set screw locations. This will anchor the rail. Also made some clearance cuts:
(http://i.imgur.com/JFsbHQi.jpg)

Also cut a slot in the bottom so it would sit flat on the ribbed frame. The rear screw is a 6-40 x 5/8” shcs, and the front is a modified 10-32 with a small o-ring for a washer:
(http://i.imgur.com/npEF8Ib.jpg)

Attached to the gun:
(http://i.imgur.com/vhONh8P.jpg)

The last thing was a some more pre-load on the spring. With a longer barrel, in theory, you can hit the valve a little harder.
(http://i.imgur.com/5oDJMc1.jpg)
(http://i.imgur.com/r6DqK4y.jpg)

I built the other one the same and added some wood grips and optics:
(http://i.imgur.com/Hlg06jm.jpg)

They shoot around 480 to 500 fps with H&N 13.73 gr. Here’s three 10-shot groups from each gun, 10m, rested.
(http://i.imgur.com/4JeMz4C.jpg)

Part1:  https://www.gatewaytoairguns.org/GTA/index.php?topic=121809.msg1181445#msg1181445 (https://www.gatewaytoairguns.org/GTA/index.php?topic=121809.msg1181445#msg1181445)
Part2:  https://www.gatewaytoairguns.org/GTA/index.php?topic=121810.msg1181446#msg1181446 (https://www.gatewaytoairguns.org/GTA/index.php?topic=121810.msg1181446#msg1181446)

Thanks -

Wyo
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: 45flint on February 11, 2017, 09:20:41 AM
Awesome, you guys that can machine things amaze me.
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: Hobbyman2007 on February 20, 2017, 08:17:59 PM
Absolutely beautiful Wyo. I can't believe the amount of work that went into these pistols ,not to mention the all metal parts . They sure don't make them like they used to.
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: ax57 on February 20, 2017, 10:33:03 PM
I love to see build/mod threads like this where the workmanship is of such high quality and each step is well-documented with photographs.  Threads like this really do inspire some of us to start our projects.  (Not that I could do work like this.)
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: WyoMan on February 21, 2017, 11:42:30 PM
Thanks, guys. I appreciate that. I'm not really a machinist, though... more like a caveman... ice age era:

Wyo
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: Grandspud on October 05, 2017, 11:22:13 PM
Wow! Thanks for the detailed information, especially the close-up photos of the action's springs. I have a few C 600s and this will help me greatly.
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: Viper1357 on November 22, 2017, 10:59:45 PM
I'll just add my thanks here as well and hang on to your 3 threads. The detailed explanations and pics are really helpful. I have a C 600 that I inherited from my Father-in-Law in the late 80's, and sadly didn't start re-shooting it (not sure the last time he did either) until the mid 90's, but since then I shoot it 2 to 3 times a year. It still holds air and 'seems' powerful enough. I just got a chrony, so after reading your 600 restoration, I guess it's time to test mine and see if mine needs one.

Thanks again!
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: kelvinator on November 24, 2017, 10:44:13 AM
Wow, very nice work.
This is exactly how I would do a 600, if I could.
If you ever decide to part with one, I call 1st dibs, HA.
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: WD Feese on November 25, 2017, 07:47:12 PM
Great post.  Bought a 600 about an hour ago at an antique mall.  Perfect timing.  Thanks.
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: 63FI on July 17, 2020, 12:22:40 PM
My 600 needs quite a bit of work and I am glad to find this 3 part article. Thanks to everyone involved!!
Title: Re: Crosman 600 Restoration – Part 3 of 3 (mods)
Post by: rocks on July 19, 2020, 04:17:49 PM
 Hi Lue send it to Henry Ford in south Carolina FIND HIM ON E-BAY CROSMAN600REPAIR, HE'S DAME GOOD