I have been shooting Beretta's for a few years,,,I have had problems with lite 1 oz and 7/8 oz loads that were made for first shot in doubles,,,,triger would not set for second shot,,,,can be converted to mechanical trigers,,,try Coles
If the trigger does not set for the second shot you can try adding a little weight to the inertia block. A little square of lead tape stuck to the side of the block works well. The tape is called swing weight tape and is available at your local golf pro shop. HMB
TLC, If your Beretta works with loads other than one ounce help is at hand. Beretta make a light inertia block spring (molla massa) for just such problem. I fitted several when light loads appeared in the uk. I cannot remember the part number , the only difference being the lighter gauge of wire used. The part number is something like C54221/2 ???? ...no need to mess with anything else. Steve B
If the trigger block is not resetting due to low recoil, the spring is the way to go. I would still diagnose it first. Make sure it fails to reset with either barrel, then it is likely the trigger block.
My 682 was doing the same thing. I took the trigger apart and polished up the rough edges on the inertia block, cleaned it all up and lightly oiled. Works great now and sets the second trigger fine.
Good luck with it.
Take the stock off and observe the inertia block lever (just forward of the inertia block). The lever has to rotate somewhat up and forward to set the second trigger. Cock both triggers, release one, and manually rotate the inertia block rearward. If the lever spring is weak or broken, the lever won’t jump forward. Cole has the spring if needed but putting it in is a bitch.
If this is a problem that has just recently developed, as in the gun use to work well, then my guess is that the lower end of the inertia reset spring has broken off and needs to be replaced. New springs are available from Beretta USA at low cost, get two or three of them. Replacing the spring requires you to get into the lockwork and that is a bit intimidating, you may want to have a pro do this. A mechanical conversion is also an option you may want to consider.
several months ago I posted about replacing the spring.....I can do one now in 15 minutes with a toothpick and a piece of dental floss. If it comes to it, let me know and I will explain. (toothpick and floss....I am NOT kidding) Frank C.
Lots of good gunsmiths will fix a 682. Gun Dr. on this forum is one, Coles in Maine is another. If the gun has always had this problem, there is some polishing that needs to be done, if gun has worked fine and has developed this problem - it needs repair. Either way, going to mechanical triggers will fix the problem.
Subject: Beretta 687 will not fire 2nd barrel Help Pls.
From: Frank C
Date: Thu, Jul 24, 2008 - 09:34 PM ET
Wolfram, I spoke with Ed Haley aka Tammers and taking his advice I used what I now call the "toothpick and dental floss" technique, the 1/4 inch piece of toothpick holds the spring in place in the inertia block and a loop of floss is used to lift up the tab end of the spring so it will lay backwards towards the rear of the gun, gentle pressure on the floss will lift the spring/tab and the inertia block falls easily into place, then just easily push out the toothpick with the pin and cut and slide out the floss.......10 minutes and good as new!!! Thanks to ALL for the advice, the floss is the key to tensioning the spring! Frank