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Jim Gillilan's Custom 1322 Carbine

Jim Gillilan's Custom 1322 Carbine w/Custom Stock

Here's one I'm especially proud of and is modded all over, doing 12fpe at 15 pumps.
Stock is Teak from Thailand and super light weight 1322 Carbine!

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Hammer questions

June 18 2017 at 7:06 AM
Steve  (Login fieldpoint)
Crosman Forum Member
from IP address 96.236.138.154

I am building a 1340 of sorts and want to replace the hammer with the 1377 hammer. I know the stock 2240 sear won't engage the 1377 hammer but I will be making a custom sear to accommodate the hammer and the paintball grip I am going to use. Question is will the smaller hammer open the valve enough for any reasonable performance? I am going to use a 7 inch barrel and I'm going more for a look than performance. Accuracy is more important to me than power so a fairly low velocity is OK. A second question is how much power can I make up (if needed) with the hammer spring.

Another question is what material would you pick for the sear and how hard would you make the sear. I was thinking an old file might work. Would it be hardened all the way through or just the contact points. I never made a sear but have done a few folding knives and tools for work.

Grip is like this:https://sep.yimg.com/ca/I/paintballgate_2268_64060604

 
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AuthorReply

Steve in NC
(Login pneuguy)
Crosman Forum Member
162.198.201.47

Good news: Both 2240 and 1377 use exactly the same Crosman part number sear: 1322A048

June 18 2017, 7:23 PM 

However, worse news is that the 1377 hammer is the wrong diameter to work in the (larger) 1740 tube.

 
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Steve
(Login fieldpoint)
Crosman Forum Member
75.151.252.74

Re: Good news: Both 2240 and 1377 use exactly the same Crosman part number sear: 1322A048

June 19 2017, 9:43 AM 

Not sure I understand your answer. I realized that the hammers are different diameters which lead me to the need for a custom sear. The detail of accommodating the smaller hammer in the larger tube is being address with a tube inside the 1740 tube of the 1377 hammer diameter. The design is not usual and would not be done but I am trying to make something you don't typically see not really trying to push to performance envelope.

Basically will the hammer open the valve?

 
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cobalt
(Login cobalt327)
Crosman Forum Member
68.184.158.177

Re: Hammer questions

June 20 2017, 1:27 PM 

More hammer spring rate = more cocking effort as I'm sure you realize. At some point the pin will start to deflect. Enough deflection results in a bent or broken pin so there's a limited amount of relief the stronger spring with a lighter hammer can give you.

If I were doing this, I would simply mock it up and see what the results were using the lighter hammer and whatever springs you have on hand. That should tell you whether a stronger spring is a viable solution or if you need to go w/a lighter internal valve spring or some other combination of tweaks.

Good luck and keep us posted on your progress.


    
This message has been edited by cobalt327 from IP address 68.184.158.177 on Jun 20, 2017 1:28 PM


 
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Steve
(Login fieldpoint)
Crosman Forum Member
96.236.138.154

Re: Hammer questions

June 20 2017, 3:55 PM 

Oh Yes, good idea in using a lighter valve spring, I didn't think of that.

Thank you for you response.


 
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Steve
(Login fieldpoint)
Crosman Forum Member
96.236.138.154

Re: Hammer questions

June 20 2017, 9:10 PM 

Some images of what I am doing.

[linked image]
[linked image]
[linked image]

 
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ped
(Login --ped--)
Crosman Forum Member
94.8.65.133

Re: Hammer questions

June 21 2017, 3:50 PM 

like that looks very nice

 
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Steve
(Login fieldpoint)
Crosman Forum Member
96.236.138.154

Thanks, ped! n/t

June 21 2017, 3:58 PM 



    
This message has been edited by fieldpoint from IP address 96.236.138.154 on Jun 21, 2017 4:13 PM


 
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cobalt
(Login cobalt327)
Crosman Forum Member
68.184.158.177

Quite unique

June 21 2017, 8:25 PM 

I like the look. Industrial- tough and functional. Will some smoothing of the edges come at some point? What type finish are you considering? Sights?

 
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Steve
(Login fieldpoint)
Crosman Forum Member
75.151.252.74

Re: Quite unique

June 22 2017, 6:53 AM 

Thanks cobalt,

Yes, there will be some chaffering on the edges and I hope to blend the barrel shroud and main tube together so there is as little seem as possible.

The sights I have not decided on yet but I was thinking maybe a weaver/picatinny rail on the whole length of the top. Most likely open sights, but the right(=cheap) red dot or pistol scope could go on.

The finish I would like to do is DIY anodizing in red. That would really make it pop. Maybe a rail in white or clear anodizing.

I could defiantly see a big red dot in sliver, natural color on top.(too 90's? lol!)



    
This message has been edited by fieldpoint from IP address 75.151.252.74 on Jun 22, 2017 10:52 AM


 
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