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Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



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Can a bigger screw be used to mount the breach...

August 6 2012 at 7:25 AM

Andy  (Login airgunandy)
Crosman Forum Member
from IP address 206.208.93.60

...of a 13xx or 22xx gun? You know, the little one in front of or under the bolt?
I have a 2200 that I'm contemplating using the pump tube and parts for my 1377 rifle conversion. The only #4 taps I see locally are for coarse threads. The breach screws are fine thread aren't they? Has anyone tried a #6 screw?

Thanks!
Andy

I plink, therefore I am.

 
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AuthorReply
eJames S
(Login jamesinadvance)
Crosman Forum Member
66.226.62.189

I have used a #5, after reshaping the head

August 6 2012, 8:08 AM 

I would not use the commonly available 6X32 the thread is to coarse, there just isn't enough "meat" in the tube for a larger screw . Smaller taps and screws are available through industrial suppliers and hobby shops they are just not commonly available due to the small volume of sales,
If you need a larger screw due to a damaged thread I would reccomend a 5X44 or a 5X40 these are available through McMaster Carr at:
http://www.mcmaster.com

They also carry a 6X48 screw but I'm not sure if the head of this screw can be modified enough to fit the guns in question without modifying the breech itself which is something I would not want to attempt.



James S

 
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Anthony R
(Login fivestar45)
Crosman Forum Member
166.248.4.186

Andy You've

August 6 2012, 12:10 PM 

been involved with these 22xx platform guns for a while now, so my advise would be to bite the bullet and buy a 4/48 tap from one of the machine equipment suppliers, as in all probability you'll need it more than once. You can re-drill and tap the tube for a #5 or #6-48 but that tap isn't east to find either and going to a courser tap won't get many threads in a 1/16" thick tube wall. And after that you will have to try to keep the new larger screw head size from being in the way. If you have a problem finding a 4-48 tap, drop me a note and I'll give you a supplier.

 
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MIke T.
(Login TKO22)
Crosman Forum Member
68.15.228.128

I have a extra 4-48 tap....

August 6 2012, 5:25 PM 

you can use, then pass it around to those that might need it.

This comes up several times a year on here. Maybe we all can use it as a "passaround loaner" tap. It's quite delicate, but it's the best one available and easily cuts the hardest Stainless Steels.

Let me know.

MIke T.
TKO - Omaha, NE USA
402-889-9222
www.tko22.com

 
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Anthony R
(Login fivestar45)
Crosman Forum Member
69.22.251.234

Great Idea Mike..............n/t

August 6 2012, 7:35 PM 


 
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Andy
(Login airgunandy)
Crosman Forum Member
206.208.93.60

Thanks guys.

August 7 2012, 5:58 AM 

I'll see what I can come up with. I may take Mike up on his offer.

I plink, therefore I am.

 
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Trevor
(Login Dnadnnoid)
Crosman Forum Member
98.232.166.154

i don't get it..

August 7 2012, 7:13 PM 

why bother with the trouble of passing around a tool that everybody needs when they're only a few bucks on ebay? just buy your own...

 
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Andy
(Login airgunandy)
Crosman Forum Member
65.190.155.55

Thanks!

August 7 2012, 8:06 PM 

There are a bunch of them!

I plink, therefore I am.

 
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