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No idea, check at the "Panzer Arms M4 Clone" forum.

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.

😂😂😂👌

That is 120 yo technology, though effective. The problems are, they're a pain to get on and off and unless you remove them you cannot see clearly if rust is forming on your barrel. Briley's handguard wraps nearly around the barrel, and is relatively easy on and off as it utilizes the OEM handguard mounts. Here's a pic, mine is Cerakoted.

RailScales