Intermitant trigger malfunction

I'm having trouble visualizing which pin (firing pin???) you're talking about. How sure are you that the rifle has been reassembled correctly? Could you post a picture so we can see how it's assembled? One shot (no pun) of the assembled trigger group would be good, then another shot of the bolt & carrier.

Weak main spring. It's the back-most pin in the trigger group. The spring isn't moving fast enough to get the hammer past the half **** notch on the hammer. It's catching the sear. In a pinch, you can just jerk the trigger extra stout, no hesitation. If you have a decent stone, you can stone off the half **** notch on the hammer. The half **** is when you pull the trigger group out of the gun and hold the hammer lightly as you pull the trigger. The spot where the hammer locks straight up and down is the half **** notch. Current hammers don't have the half ****....it's simply not necessary. It was a redundant safety feature if the gun ever fell hard when cocked and chambered. It causes more probs than it fixes, though. You can replace your hammer with a new part....all of them fit including the Mossberg 500 lines....or you can stone the notch yourself....or you can replace the main spring. All will fix your prob.

Great gun, btw! I have one and love it!

Model 61, 62a, the 61 is hammerless and the 62a has a hammer, the safety on the 62 is the hammer, the safety on the 61 is a cross bolt, sounds like it is gummed up, or busted, I would take out the trigger houseing and clean it up and check it out. If the cross bolt is stuck, something is blocking it, like the hammer at half c0ck, try pushing the trigger forward and see if it moves, whatever happens, I would still take it apart and clean it, don't screw it up, it is a very collectable rifle.

Test the brushes by catching it in a stalled condition when you have it triggered, then rotate it slightly. If it takes off suspect the brushes or a dead segment on the comutator.

If it doesn't respond to this, then consider the VSR trigger... open it and test by bypassing it when in stalled condition...

Less Than Perfect
The Model 88 had its faults. The trigger moves with the lever and the resulting linkage to the sear results in a rather spongy, creepy trigger break. If you want to see your gunsmith turn pale, waltz into the shop with an M88 and ask for a crisp three-pound trigger.

If you already have taken the gun apart, don't be afraid to hone the parts on a stone , keep them flat, you don't want anything rounded off. Especially the sear. I found that quote up top from a winchester sight,

If you are asking what I think you are, pull and hold the hammer back with your thumb (it is spring loaded so don't let it slip), squeeze the trigger and hold it depressed, "Slowly" EASE the hammer forward until it is back to it's original position, then release the trigger. I hope this answered your question.

most all guns made now with a hammer use the transfer bar system for safety to make sure that it will not fire unless the trigger is pulled. **** the hammer and hold it back while you pull the trigger. You should see a flat bar move up and position itself between the hammer and the firing pin and this transfers the force from the hammer to the firing pin. If you do not see this happen then you need to take it to a gunsmith and get it repaired. hope this helps you.

You will need a new trigger switch, parts are available at this link

http://www.dewaltservicenet.com/


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On most all nailguns when the trigger is activated air pressure is released from the headvalve causing the headvalve to open and fire the piston. If air leaks through the headvalve orings or through the headgasket port to headvalve, it will not fire. Try applying light grease to headvalve orings and make sure that headgasket is sealing around vent hole. If it fires then replace orings in headvalve for long term repair. Secondary problem is worn safety parts and trigger or trigger pin. If these parts are worn the trigger will not push the trigger valve pin all the way in when you bump fire the gun. With air supply disconnected, apply pressure to safety while depressing the trigger and check thet the pin is moving all the way into the trigger valve. Adjust or replace as necessary. Enjoy