What is wrong when a Carbine doubles?

[gunner]

Today i was shooting my Carbine and it doubled two times. Do you know a reason why this happened? All is looking OK . Any suggestions?

Thank you in advance

Ulrich

Information

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[Buntlineguy]

Has the trigger pull been modified? Too light of a squeeze on the trigger? Military rifles are often meant to be pulled at a faster, harder pull.
B

[vintage hunter]

Worn/ modified sear. Firing pin protrusion out of spec or sticking. High primers, the wrong type primers ( Small pistol) with hand loads. Just a few thoughts.

[browningautorifle]

Vintage Hunter's right. You need new parts. They are NOT meant to be yanked to fire. Standard squeeze. Examine and replace or maybe have someone have a look.

[JBS]

Ulrich, remove the fire control group. Check that the sear spring is in place and not damaged or worn out. Make sure that the sear is able to move up and down on the trigger body and that it's tail sits over the trigger ledge. The sear moves independent of the trigger to catch the hammer and prevent multi fires. Make sure the sear face that catches the sear ledge on the hammer is not damaged or worn round, it must engage the hammer solidly. After cleaning and inspection you can function test by hand cocking the hammer. With your thumb in the way to catch the hammer and preventing it from striking the frame pull the trigger. While still holding trigger to rear thumb cock the hammer. The sear should snap up and catch the hammer notch. Then release the trigger and see that the rear of the sear sits over the trigger lip at the rear. If any of this fails you may need to replace the worn parts,,,,trigger, sear, or sear spring.

If all insp OK turn your attention to the bolt. Strip it and clean making sure that the firing pin is completely free floating when reassembled.

[JBS]

Ulrich, it was late last night when I replied and I left a key part out. The Sear has an oval mounting hole. The Sear must be able to move forward and backward when installed in the trigger. Make sure the hole is not plugged up with junk and preventing the Sear from full movement, forward, backward, and up and down.

[JBS]

Attachment 20278Have major trouble attaching a photo to a thread now, the load process has changed

[gunner]

Hi JBS,

seems that the sear is the problem. What do you think, is adding material by laser welding worth an try? I´m looking for an new one and hope that i will find one over here.

[JBS]

If it is the Sear nose that makes contact with the hammer step, well yes if you know a very good machinest that can add some high grade material back. You would then need to temper it and case harded the nose. You would still need an original for getting the finished measurements or the mechanical drawings.

You are much better off replaceing the Sear with a new original. A Carbine Sear is not hard to find even on your side of the ocean.

[JimF4M1s (Deceased)]

Are there any restrictions in sending one from the US to Germany? It's only a $10-$15 part plus shipping for an Inland, more if you need a harder to find maker like Rock-Ola or IP/S'G'.