No! it is because the rifle is designed to fire the right barrel first, and so the laft trigger doesn’t have to have a heavier than normal trigger pull the maker put an interceptor ( inertia activated sear block) to avoid recoil from the right barrel setting off the left barrel. This explains why firing the left barrel first sometimes causes the right barrel to fire because of the light trigger pull on that barrel. The better design would be to have the recoil interceptor on both sears then it wouldn’t matter which trigger you pulled as long as you didn’t strum the triggers with you finger.

Doubles caused by strumming causes the other barrel to go off because the trigger finger slips past the front trigger and touches the back trigger because of the recoil of the front trigger’s right barrel. In this case the left barrel fires a split second later than the first shot so are really a very quick one, two shots not simultaneous shots.

With a real doubling being caused by the recoil when the first barrel is fired the other barrel is set off because the sear engagement on that barrel is too light. In the Merkel big bore is designed to fire the right first they installed an interceptor on the left barrel to avoid that barrel being set off by the recoil of the right barrel. This way the left barrel can have a light trigger pull as well. Since both barrels have a light trigger pull if the left barrel, (back trigger) is pulled first it sometimes will set off the right barrel as well.

This is what I couldn’t understand about my rifle , because three other people, all pulling the back trigger first caused a double discharge, and I could understand why, or how that was happening. Rt Trigger first the left trigger was blocked, but left trigger first the right trigger was not blocked. The pictures of the design posted has answered my question as to why this happened the way it did.

I hope this is at least as clear as mud!