Heat transfer to mag

Arne, with the mag placement below the barrel, did you experience any problems with heat transfer from the barrel to the mag during your 1000+ round testing?

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Permalink Reply by Arne Boberg on January 21, 2010 at 8:15pm

The most I have shot in one stretch is 400 rounds. The barrel and the unlock block were too hot to touch, but the aluminum frame was just very warm possibly because it dissipated the heat well. The trigger was warm but not too warm. Since nothing touches the magazine in a significant way except the grip area of the frame, the one magazine I was using was not noticeably warm, and it wasn't getting all that dirty even though this was Brown Bear ammo. I think the top of the magazine is fairly well protected from gases and unburned powder because of its location.

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Permalink Reply by VMole8 on January 21, 2010 at 8:34pm

Cool to hear. Also good that you're putting it through some extended sessions since that can expose weaknesses that long term high round count on its own won't.

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Permalink Reply by James on January 25, 2010 at 10:15am

I was wondering about the trigger, it looks like you have to stage it before it goes bang! Is there any thought to future designs with a double action, or a two stage trigger? like a Barreta .32 tomcat? my Kahr has a long draw stage too , i don't like it very much.
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Permalink Reply by James on January 25, 2010 at 10:19am

James said:

I was wondering about the trigger, it looks like you have to stage it before it goes bang! Is there any thought to future designs with a double action, or a two stage trigger? like a Barreta .32 tomcat? my Kahr has a long draw stage too , i don't like it very much.
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Permalink Reply by Arne Boberg on January 25, 2010 at 10:31am

I just dry-fired my Beretta Tomcat in double-action mode, and it had a "click" in the middle of the stroke, and the force built up noticeably until the hammer dropped. The XR9 force profile can be described as "flat". We may in the future go with a staged trigger - it would mean changing the camming surface on one of our parts. So far, most people have preferred the flat profile, even those who have shot the gun and compared to other guns with staged triggers.

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Permalink Reply by riffraff on January 25, 2010 at 12:00pm

Keep the "flat" trigger pull profile Arne. The 'staged' or 'progressive' triggers are crap. MOO

Mike

Arne Boberg said:

I just dry-fired my Beretta Tomcat in double-action mode, and it had a "click" in the middle of the stroke, and the force built up noticeably until the hammer dropped. The XR9 force profile can be described as "flat". We may in the future go with a staged trigger - it would mean changing the camming surface on one of our parts. So far, most people have preferred the flat profile, even those who have shot the gun and compared to other guns with staged triggers.

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Permalink Reply by Blueorison on January 27, 2010 at 2:37am

Exactly. Why would he change it to a 2 stage...? For the purposes and philosophy intended, a smooth letoff is best. I only use 2 stage triggers in CMP hipower competition and stationary competitions, where it should stay. A good practical non-competition trigger should allow you to be 'surprised' when the gun goes off. Progressive triggers just incite tendencies of poor trigger control (jerking, wrist breaking, etc.).

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Permalink Reply by Talibani on October 30, 2010 at 11:39pm

I guess overheating will not be a problem for most folks. I just cannot imagine a situation when I’ll have to shoot so many rounds in a quick succession.