MR556's have a tab on the barrel extension and a corresponding slot on the carrier to prevent use of a 416 FA carrier. Easy enough to remove on the extension. Barrel, as noted, is thicker with no chrome lining. It is the same material though, as the 416 barrel, and is CHF.

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    The MR556 is the semi-auto-only civilian version of the HK 416. The HK 416 is essentially a gas piston M4. For those not familiar, the standard AR-15 is direct gas impingement (DI) which means that combustion gases during firing are fed back into the bolt carrier to unlock the breech and cycle the action.

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    Jun 03, 2020 · Item Description: Brand new Aero Precision M5 bolt carrier group in black nitride. Bolt is brand new, Haven’t even taken it out of the package. ... HK MR556 5.56 ... Jun 19, 2019 · It includes the complete upper receiver and barrel assembly, the bolt carrier assembly, buffer, and buffer spring. According to H&K is allows most high-quality 5.56 mm AR-style rifles to be retrofitted to HK’s pusher rod system. Here’s what the MR556 upper includes – listed and pictured (sadly low-res):

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