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Wow! I’m blown away that you found some. Thank you!

Numrich Gun Parts has some in stock

Hi all, There have been some questions about how difficult it is to disassemble the trigger group of the Benelli M4 in order to install a US made hammer, disconnector and trigger. The difficulty level of this job depends on what tools you have on hand. With the wrong equipment, plan on swearing a lot. This disassembly requires that you manipulate a lot of small pins and springs. Do yourself a favor and get yourself a proper set of roll punches, roll pin holders, snap ring pliers, disassembly block and dental picks. Brownells has an awesome selection that will last you a lifetime. First off, ensure that your Benelli M4 is unloaded. Remove all ammunition from the weapon and remove it from your work area. Now, remove the bolt handle, and use it to push out the trigger group's Axle Bushing. Once it is started, you can pull it the rest of the way from the opposite side of the receiver. Press the bolt release and pull the trigger group downward and away from the stock. The entire assembly will pull out.

Insert your Disconnector as shown in the photograph. Prepare yourself for some swearing. Compress the Disconnector so that you can pass your roll pin punch through the retaining pin hole. This will act as a slave pin and hold the assembly together as you try to insert the Disconnector Pin. You can attempt to use a roll pin holder like shown below to assist with installing the Disconnector Pin, however the pin is so small that it is difficult to use since it barely protrudes from the Roll Pin Holder.

At this point, you have fully disassembled the Trigger Assembly as much as needed to install the new Hammer, Disconnector and Trigger. At this point, it is time to reassemble. Install the factory Disconnector Spring and factory Disconnector Plunger into the Trigger you plan to use. The spring slips over the end of the Disconnector Plunger and presses into a hole in the trigger as shown below.

Using a punch, tap out the small Disconnector Pin. This will allow you to remove the Disconnector, the Disconnector Plunger and the Disconnector Spring. The Disconnector Plunger is under spring tension, so keep your thumb on it while you pull out the punch. Remember, once you push a roll punch all the way through, the punch will act as a slave pin and hold the assembly together.

Now, to further disassemble the trigger and disconnector. The Trigger Spring simply pulls out of the Trigger.

Once the pin is free, remove the Shell Release Lever Spring.

Using a pick, disengage the Shell Release Lever Spring from the notch on the Shell Release Lever. This will relieve spring tension and make disassembly much easier. Using a punch, tap out the Trigger Pin. Using a block such as the one in the photo below allows for the pin to fall out freely.

Once the Hammer is removed, you may now pull out the Hammer Spring cap and the Hammer Spring. At this point, you can install your new hammer, or push the Trigger Pin Bushing back into place if you plan to further disassemble the Trigger Group.

Now, using a punch, push the Trigger Pin Bushing approximately half way out of the trigger group assembly. You do not want to push this pin completely out, since it retains the Shell Release Lever also. You want to push it out enough for the Hammer to detatch. Be careful of the Hammer Spring Cap. It is under spring tension and will launch across the room when the Shell Release Lever slips off of the top of the cap. Control the cap with your thumb as you relieve spring tension. Note the red line on the following photograph.

Now, take your snap ring pliers and remove the Trigger Guard Pin Spring from the Trigger Group.