What is wrong when a Carbine doubles?

[Johnny Peppers]

The primary cause of doubling in the M1 Rifle is operator induced. In virtually all cases the rifle only doubles, and never more than that. The trigger is pulled very slowly, and the rifle held lightly against the shoulder; many times from a benchrest. When the rifle recoils it hits the shoulder and bounces back forward where the trigger finger is still around the trigger, firing it.
If it were the sear, would it stop at only one extra shot, or would it fire multiple shots?

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[gunner]

The primary cause of doubling in the M1 Rifle is operator induced. In virtually all cases the rifle only doubles, and never more than that. The trigger is pulled very slowly, and the rifle held lightly against the shoulder; many times from a benchrest. When the rifle recoils it hits the shoulder and bounces back forward where the trigger finger is still around the trigger, firing it.
If it were the sear, would it stop at only one extra shot, or would it fire multiple shots?

Hi, it stops after one extra round( that costs me a crade of beer yesterday because i hit the light at 30meters). I´m shooting of hand from prone position and think that i hold it tight enough but i´ll have a look at the next time if it is really tight enough.

---------- Post added at 08:17 PM ---------- Previous post was at 08:14 PM ----------

I had one that would do about 8 to 15. As long as you held the trigger back. Let off trigger and it would load a live round with a dead hammer.
From what I have read this did take place at times during production.
It was the sear spring..New spring and no problems...

...worth an try! Thank you.

[Johnny Peppers]

8 to 15 times is definitely mechanical problems. Match tuned semi-auto rifles fired from the bench are bad about doubling for the reason mentioned above.