Here’s the complete tear down for the Franchi AL48. The below is on a late model 12 gauge and older and sub gauges could differ slightly.
Remove the forearm nut, forearm, barrel, friction ring, and barrel return spring. Knock out the trigger group pins (left to right) and remove the trigger group. With a flat tip screwdriver press down the bolt return spring follower/cup.
This will let the bolt link comes out of the cup. It helps to hold the gun pointing up while holding it with you left hand and your thumb on the bolt handle.
Now you can slide the bolt handle out of the back of the bolt body. Push the bolt link towards the top of the receiver and push the bolt out of the receiver. Knock out the bottom pin from the bolt and remove the lever that is rounded in the front along with the spring and sleeve. Turn the bolt over on its left side and shake it a little. The pin that connects the bolt link to the bolt body will fall out. Rotate the locking lug out of the bolt body. With a roll pin or pin punch, knock out the roll pin at the back of the bolt. Now the firing pin and spring can be removed. Here’s what the bolt looks like taken apart.
Remove the recoil pad with a #1 Phillips screwdriver, making sure to wet the pad where the holes are to prevent tearing. Remove the stock bolt with a 11mm socket or a 5/16 slotted screwdriver. With a 3 /8 flat tip screwdriver or drag link socket break loose the bolt return spring plug at the end of the spring tube. Warning: it’s under spring tension so make sure you are ready when near the end of the threads. Remove the spring and follower cup.
Use a pair of snap ring pliers to remove the magazine spring retainer at the end of the magazine tube. Warning it’s under spring tension. Remove the spring, plug (if applicable, and the follower.
Clean the parts with a solvent like Hoppes #9 etc. Spray the receiver and the trigger group with a gun scrubber and let them set a little. For oil use a good one like CLP, FP-10, or Militec. Lightly lube the firing pin and spring and install back into the bolt. Lightly lube the locking lug and the groove and install back in to the bolt. Lightly lube the other spring and pins and replace them on the bolt along with the link.
Clean the insides of the bolt return and magazine tubes with a patch and solvent like your barrel. Clean the springs and their followers. Lightly lube their springs and put these assemblies back together. The best way to put the plug in for the bolt return tube is to thread a Phillips or Torx driver thru them and push it down and twist to start threading it into the tube.
Put a drop or two of oil in the receiver rails and let it run backwards. Then slide the bolt assembly into the receiver. Once part way in slide the bolt handle into the bolt from behind. Pay attention to the cut out in the bolt link and the nub that sticks out on the bolt handle. Push the link towards the top of the receiver to get the bolt into the receiver. Put the link into the bolt return spring follower cup.
Clean the out side of the magazine tube, barrel return spring, friction ring, and barrel band with a solvent. Lightly lube the out side of the spring and magazine tube and reassemble. I also like to lightly lube the outside of the barrel extension.