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I found a NIB M4 early last year and sent it out to California for the Agency Arms build. Details Include: Agency Arms octagonal Extension Tube Kit (Increases TOTAL capacity to 7+1, 9 if ghostloading), Barrel Porting, Agency Arms Extended Carrier, Agency Arms Extended Bolt Release, Agency Arms Extended Charging Handle, Modified Bolt Carrier, Receiver Loading Port Machining, Agency Arms MLOK® handguard/rail, Gunsmith trigger job, texturing of the stock (on select models) and installation of an oversized dome safety. Extended Carrier and Bolt Carrier are polished and refinished in a PVD coating. I added the Scalarworks Sync with 6MOA RMR, a few RailScales, Agency RMR matching screws and thats a wrap. I ordered a tritium ghost ring and front post but will stick with the factory sights for now. It's really a different feeling gun now in a good way. I have a preban HK M1a and an M2 but the M4 is night and day to the other guns.

If you want the parts to fit, you're going to need to file on the hammer. You'll want to remove material from the sear contact that engages the disconnector. You remove enough to the point that the sear will slip past the disconnector when the trigger is not being pressed. It only takes about 5-10 minutes to remove enough material to resolve the issue. A file with a safe edge works best so you can use it as a guide against the hammer body to keep your file straight. I don't know where the issue lies anymore. It seems the aftermarket parts are needing fitting these days in both the OEM and A&S frames. In the past the parts were all drop in without any issues.

These are the two mount bosses I was referring to.

Cool, that’s what I was wondering. I have a ‘65 convertible. The Lincoln world is a pretty small community.

The New SBE 3 20 gauge actually weighs the exact same as the M2 20 Gauge comparing 26" barrel's. There is some key differences: ComforTech 3 vs ComforTech Combtech cheeks pad on SBE 3 Easy Locking Bolt System SBE 3 New Carrier Latch Design on SBE 3, ease of loading, durability Different Triger Guard Different Safety size IMO - key segment into the SBE & Etho's platforms.

Work around for if the color bugs you:

Geissele made only a hammer. The only performance benefit from it was how hard the surface treatment is. They show very little wear after thousands of rounds. Even the OEM hammer gets beat up a little when hitting the firing pin and the base of the bolt carrier. They’re not worth the retarded prices we see since I have never seen a M4 hammer work out to the point that it stopped functioning. I’ve installed probably 50 sets of FFT trigger packs. I haven’t had one fail. I have had to fit a few to certain trigger packs in the past. The fitting was minor. Mainly the hammer wouldn’t move freely since the trigger frame was too narrow. This only occurred on the old aluminum OEM frames. Not saying it can’t happen on the polymer ones, but I haven’t seen it. These trigger kits are getting difficult to get from FFT. It’s always a waiting game for the past few years. I have no idea who actually makes them for them. Briley makes decent stuff and would be an excellent option. Some don’t like the titanium nitrate finish on the trigger. You could have it painted whatever color you want. I’m not sure if they make the parts in house or not. I have no experience with the set that Benelliparts sells.