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Discussion Starter · #1 ·
Ok here's my question.Does the Trigger slap on the XCR bug the hell out of anyone else? I've never owned a rifle that did this,but I've shot a few AK's that had the affliction so I know what it feels like.Well It hasn't been a big issue for me because the "XCR slap" isn't as bad as some.However since doing my trigger job on it,I notice it more now,plus I've been shooting it more.
So I figured if it works anything like the AK,it has something to do with trigger geometry and the bolt carrier reciprocating over the hammer,which in turn bumps the disconnector,which hits the trigger giving it that annoying stinging effect.So after close examination of the trigger "works" and hypothesizing what the possible solution might be,heres what I came up with.
The bottom edge of the shelf on the hammer hits the disconnector on it's rearward travel to be re-cocked.So what I did was take the hammer out and grind just a little off the portion(see pic) that was striking the disconnector.This should not affect anything other than the trigger slap,you won't change you trigger pull weight or anything by doing this.
I've not done a full scale shooting session since I did this.It was dark and cold,so I only fired 5 to test.I didn't want to get local 5-0 called either.From what I can tell so far,it is completely gone.It only take about 10 seconds on a bench grinder and another 30 seconds with a fine file to smooth it up and that's it.Always remember less is more sometimes,in other words don't get grinder happy.Just thought I would share.
 

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Working the hammer by hand I see what you mean. But I have never felt this during shooting. My trigger movement is about 1mm.
 

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Discussion Starter · #5 ·
Actually Charliea what causes the trigger to not reset is the top corner,not the bottom corner.Yes it does hang on the disconnector though and it does so after the bolt carrier has cycled forward,then when you let off the trigger so it can reset that top corner hangs on the hook on the disconnect,not allowing the hammer to return.
The problem of "slap" occurs basically opposite of "failure to rest".In other words the bolt is coming back and as the carrier pushes the hammer back(hard)the bottom of that bump(on the hammer) smacks the disconnector hard enough to "slap" the trigger.Therefore removing a little material from the bottom of the bump causes less force on the front of the hook on the disconnector.I hope that's not too confusing ... :duh:
Anyway I thought that trigger slap was a more common problem with the XCR.As I said it's not terrible,but I start to notice it after a few shots.It kind of makes your finger tingle a little.Hell I don't know maybe I'm just losing my mind...lol
 

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I haven't ever felt it on mine, I will pay more attention when I shoot it again. My Ruger 22/45 has a wicked slap on the last round.
 

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Discussion Starter · #7 ·
My Ruger 22/45 has a wicked slap on the last round.
Damn AZ,If my 22/45 has one I've never noticed.Ill have to try that tomorrow.I won't be out there long though,Damn wintertime.It was 8 degrees here last night.
 

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It is an older 22/45, about 8 years old. It only does it on the last shot, probably something to do with the bolt hold open. It may only do it suppressed but it has been so long since I have shot it without a suppressor that I just don't know.
 

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Discussion Starter · #10 ·
Chan67,unless Bill does something I don't know of,his regular trigger job wouldn't change the "slap" since the surfaces that affect trigger pull are not the same as the ones that cause "slap".
AZ,I would think the suppressor would increase bolt velocity,if that were true however,I would think it would do it everytime.That is just strange,mine might be 6 years old.I wanted to get the MK3 but when I found it had a magazine safety I said "not for me thanks". I don't know how hard it would be to disengage.I cannot tolerate a magazine safety.It's one of my pistol pet peeves.they are about as useless as windshield wipers on a horses ass!!
 

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It is quite easy to get rid of the mag safety. I have been doing lots of research lately as I want to get a pac-lite barrel for a new gun. I will be perusing the pawn shops when I get back for a decent Ruger MKII or III
 

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I'm confused by the picture (mostly b/c I'm stupid).....


Did you round the whole ledge there or just that corner?

Sean
 

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Discussion Starter · #13 ·
I'm sorry I see what you mean,I meant the whole self.The pic was only to suggest how much rounding,but not just the corner.
 

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Cool. Thanks for the info.

Sean
 

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So I just finished this up. When I took things apart, I noted that I could induce slap just by manually resetting the hammer :-\ I rounded off the corner with a file and cleaned it up with some paper. Now its smooth as butter ;D Now I just need to replace the grip screw for the single stage setting.




While I was in there, I cleaned up the sear engagement and removed a bit of the front trunnion to allow the halves to open a bit wider for cleaning.



It opens nice and wide now, and it didn't take much to remove.
 

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Discussion Starter · #17 ·
Comatzd have you fired it yet since you did the work...if so did it work?
 

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Discussion Starter · #19 ·
Sweet,I didn't take off nearly that much and it fixed mine,you should be good to go.
 

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I just got a 1-1/4" bolt for the grip screw and it is too short! Anyway, after looking at it, if I take off just a little from the tail of the trigger where it hits the safety, I think I could take up almost all the 1st stage slack.

Something for later this weekend. My wife loves it when I spread gun parts around the living room >:D
 
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