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 Post subject: Disco Trigger woes
PostPosted: Mon Jul 15, 2013 8:31 pm 
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Joined: Sun Jul 15, 2012 1:03 pm
Posts: 152
Location: Lindsay Ont Area
So I did the three screw trigger mod on my Discovery's trigger, I had tons of sear drag and accuracy issues but I figured these out and got the trigger adjusted nicely.

The problem: I took my Disco apart to clean it and after re-assembly it will no longer cock reliably. Because of this, I removed all the trigger adjustment screws to see if they were the problem and it still wouldn't cock properly with the stock trigger. I've looked over the parts diagram and exploded view of the gun and all the parts are correctly put back togther as far as I can tell. When I cock it, it's obvious to me that the sear isn't engaging the hammer. The weird thing is, when I take the side plate off the trigger assembly after attepting to cock the gun, the sear is stuck on the groove that goes around the hammer, It never did this before :? Yes, all the springs are in place in the trigger assmbly including the sear spring, So there shouldn't be any reason for the sear not to engage.

Also, the gun will cock when it is tipped on it's side, but it won't when it is upright in shooting position.

Needless to say, I am very confused and any help would be appreciated.

Owen.

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 Post subject: Re: Disco Trigger woes
PostPosted: Mon Jul 15, 2013 8:53 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
I'm guessing you don't have the safety pin installed.... If it's removed, the Disco won't cock reliably because it tensions the sear spring....

Bob

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Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
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Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
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 Post subject: Re: Disco Trigger woes
PostPosted: Mon Jul 15, 2013 9:08 pm 
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Joined: Sun Jul 15, 2012 1:03 pm
Posts: 152
Location: Lindsay Ont Area
No I don't have the safety installed, but I havn't had it installed for the last year and it functioned flawlessly. Nevertheless I will try it with the safty in and see if it works.

Removing the safety gave me a much lighter trigger... :cry:

Thanks

Owen

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 Post subject: Re: Disco Trigger woes
PostPosted: Tue Jul 16, 2013 12:30 am 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
Lighter.... and UNSAFE!....

If you want the best of both worlds, all you have to do is bend the sear spring about 5 degrees to reduce the second stage trigger pull.... Do NOT go 10 degrees or the gun can fire itself.... just like it does now....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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 Post subject: Re: Disco Trigger woes
PostPosted: Tue Jul 16, 2013 6:39 pm 
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Joined: Sun Jul 15, 2012 1:03 pm
Posts: 152
Location: Lindsay Ont Area
Update:

I re-installed the safety and wouldn't you know, the gun works perfectly fine now. Thanks Bob. 8)

It got me wondering, why did my gun have absolutly no problems for such a long time with out the safety installed? I had tested and bumped the trigger ect. after it's first removal and I had no issues whatsoever. I had disassembled and re-assembled the trigger countless times and it still worked perfectly without the safety. I put almost 5000 shots through the gun with out a safety: no issues.

Another thing, isn't bending the sear spring 5 degrees the equivilent to having no safety?

Not trying to argue, just learning...

Owen

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 Post subject: Re: Disco Trigger woes
PostPosted: Tue Jul 16, 2013 7:58 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8979
Location: Coalmont BC
If it's any consolation, I used my Disco for a while without the safety as well, and one day it just quit working (wouldn't cock).... I had to reinstall the pin.... I'm guessing that sometimes when you install the sear spring without the pin in place it hangs up somewhere inside the trigger housing and works OK.... OR, maybe if you increase the hammer spring load it quits working?....

You have to bend the spring more than 10* before it quits working competely (assuming the safety pin is in place), so at 5* you get about half the original tension.... I measure it with a protractor, bend it 5* and it's near perfect for my taste....

Bob

_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal;
Too many! Springers, Pumpers, CO2, but I love my PCPs and developing them!
Proud Member of the 2000+fps Club!


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