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Aimpoint T2 or H2 is my preferred choice for several platforms.

I've used the Micro T2 and ACRO P2. Prefer the P2 as it's a little more compact and weighs less.

This is my experience with the Panzer Arms M4. I took it down and removed all of the factory oil and properly lubed it. I had to ally heat to the mag tube extension to break the white thread locking compound. My first time at the range I tried a bulk Federal target load with #8 shot. Cycling was hit and miss. The fired hull ejected but the bolt didn't pick up another shell with the bolt remaining 2/3 open. I also tried some reloaded game ammo with #5 shot and some Federal LE low recoil buckshot. I had no failures to load or eject. I took it home and cleaned it. I bought a Dave's Metal Works seven shot magazine. I used the OEM magazine spring because the one that came with the mag tube was too long. I also installed a Benelli "standard" stock. The OEM pistol grip stock made the gun kick like a mule due to poor design. My second time at the range I zeroed the sights with the Fed LE buckshot and shot some slugs. No failures to feed or eject. I had to use heat to remove the gas plugs. I installed Benelli O-rings after cleaning the gas system. My third trip to the range I zeroed it with Hornady Critical Defense buckshot. I had to problems with feeding or ejection. Yesterday I shot Federal 2 3/4" magnum buckshot, Federal LE Low recoil buckshot, and slugs trying different chokes. I got the best results overall with a skeet choke tube. I plan to install an extended carrier/lifter. Do I believe it equal to a Benelli M4? No. Do I trust it? Yes. If I plan to use Federal LE buckshot, I will get some full power shells. The Federal buckshot is better IMHO but the Hornady will work. My Remington 870 and 1100 with 20" barrels with cylinder Remchokes shoot the Federal LE buckshot far tighter patterns than the M4. YMMV

There are heat treat issues with clones. Especially on the bolt head. They are not the same as a Benelli M4 I don’t care what people say. Benelli quality, although suffering the past couple years, is much better than the clones.

The extensions won’t help you for 922 compliance. General consensus is you need three US made parts if using a pistol grip stock. If you’re using the oem collapsible stock, you need four. These days 922 compliance is easy. You have a lot of options to pick from; 1. Trigger (FFT/Briley/Benelliparts) 2. Hammer (FFT/Briley/Geissele/Shootingsight/Benelliparts) 3. Disconnector (FFT/Briley/Benelliparts) 4. Handguards (FFT/Surefire/Briley/Strike Industries) 5. Trigger frame (A&S Engineering) 6. Stock (Mesa Tactical Urbino) 7. Full length magazine tube (Briley/Carriercomp/FFT/Dave’s Metalwork) 8. Magazine follower (carriercomp/FFT/Briley)