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GrandThumb recently posted a video having fun with several firearms to test on synthetic skulls to see what would happen with various calibers. The Benelli M4 nicely outfitted comes out near the end to see what a slug will do. Don’t visit if you hate fun and humor.

I honestly don't think you'd get any grief about swapping the magazine tube for a full length one piece tube. With these law enforcement M4's out in public hands, it's practically impossible to determine what model a M4 is without the box. There is zero markings on it to indicate how it came originally. Chances are you're going to end up replacing enough parts to be 922 compliant anyway and hit 922 compliance without even trying these days.

Yup other users have went that route with pretty decent success - get 2 guns, mix and match - live happy with your gun or guns. IF you would go this route and decide to sell the 1014 gun that has bad stock tube - please make sure you disclose it to the buyer that they would not be able to just put a collapsible stock on it and expect it to work properly (since without the regular stock on, no one can see the bad recoil tube). You are correct on 922 - the FFT trigger pack is what many guys have done (me included) and paired it with an A&S triggerguard. A word of additional advice - recently there have been reports of FFT trigger packs needing filed/sanded/stoned on the hammer a bit to get it to work properly in the A&S triggerguard - and the stock triggerguard for that matter. I and others can verify the need for some fitting to get the FFT to work out of the box. Just a word to the wise if you expect it to just drop in to the A&S and work clean. If you have a file, sandpaper, or stone and patience - it is not a problem. You also could luck out and have it drop in and work well. I am not up on the SBS stuff and 14" barrel - I think I have read in other posts that people have said they are hard to come by and are pricey. The other poster is correct about the blue - if it is a deal breaker that you may receive a blue one, see if you can find one in person or something beyond stock pictures on Gunbroker. I ordered mine on Gunbroker in late March, brand new, stock photo from a gun shop. Mine is a black one with an IT marking after the serial but I am not sure what that means.

I thought I would show the finished product. Now I have my original trigger with no modifications and my new trigger with all the upgrades I mentioned at the beginning of this post. Thanks to Stranger Danger for the help. Some side by side pictures below.

I didn't mention above but I am building a trigger with brand new parts rather than using the trigger that came with the gun. This way I know I have a working trigger and can also use it for a reference to make sure my new one is working correctly. Someone asked for the parts I used. They are listed below along with where I found them: AFTERMARKET PARTS Enhanced Trigger Guard - No logo (includes a trigger pin and the safety plunger retaining pin)- A&S Engineering Shotgun Reduced Effort Trigger Spring Pack (Primarily for Reduced Effort Safety Spring and Benelli Part - 70004 - Shell Release Lever Spring) - A&S Engineering FFT Trigger Pack Upgrade and Wolff Trigger Springs - Freedom Fighter Tactical FFT Worry-Free Extended Carrier - Freedom Fighter Tactical Benelli Oversized Safety - Dave’s Metal Works BENELLI OEM PARTS 70013 - Carrier Spring Plunger - Numrich Gun Parts 70018 - Breech Bolt Latch Pin - Numrich Gun Parts 70023 - Trigger Pin - Numrich Gun Parts 70022 - Shell Release Lever - Numrich Gun Parts 70017 - Breech Bolt Latch - Freedom Fighter Tactical 70005 - Safety Plunger - Freedom Fighter Tactical 70008 - Disconnector Plunger - Freedom Fighter Tactical 70016 - Hammer Spring Cap - Freedom Fighter Tactical 70007 - Disconnector Pin - Freedom Fighter Tactical 70019 - Trigger Guard Pin - Freedom Fighter Tactical 70021 - Trigger Pin Bushing - Freedom Fighter Tactical