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The 870 Remington shotgun used to be a popular candidate for a "release" trigger.
You need a gunsmith
Best to ask a gunsmith for help.
Unscrew the end cap on the stock fore-end. slide out the barrel. slide off the fore arm. punch out the two pins holding the trigger assembly. slide out the trigger assembly. remove the charging handle by pulling out as it is only held by a detent spring and ball. push in on the end of the tube opposite the stock end until the detent on the rails matches up to the small cutout on the tube. pull up on the rail and that releases the gas tube assembly and spring. press in on the spring plate that the bolt assembly runs into as your sliding it out of the receiver and the bolt and rail assembly will slide out. clean and reassemble. No lube in the gas tube area.
Pull the trigger
Depends on the shotgun.
pull forearm off. open barrel and remove. drift 2 trigger assembly pins out. pull trigger ass. down and out. now drift the barrel catch pin and the lever and catch can be removed.
To replace the trigger assembly on the 50 hp Mercury outboard, the flywheel and the stator assembly must first be removed. Next, remove the link rod from the timing advance arm and remove the trigger wires from the switchbox. Take note of how the trigger wires are routed to aid in installation of the new trigger. Now the trigger can be lifted out of the top end cap. While noting the number of turns, screw the link arm out of the old trigger, and remove the retainer nut. Install the retainer nut into the new trigger, screw in the link rod, and slide back into the end cap. Reassemble in reverse order.
You need a gunsmith, and not WikiAnswers for this one. Sorry-
First you want to remove the barrel, tank and hopper. then you need to take out the pins and slide out the rear assembly, as well as disconnecting the tombstone and the trigger assembly. Then you need to put a small amount of oil on all of the o rings, clean out any paint or grease, then reassemble it.
It is a lever inside the trigger guard, forward of the trigger.
See the link below. It may help you.