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You left out CMMG for barrels. Cherokee and 400 J&L have them.
Nothing to convert. Just change the barrel, thats it.
Pistol length gas tube.
I have a LMT MRP so I have to have the barrel sent out and "converted" to work with my upper. at least thats the system that this will go on....
Ohhh I see.....
Micro7
sorry to digthis thread out of the grave, but what dies are you using to form the brass, or does it matter? Will they all be tall enough to form the 556 to 300 before cutting with the decapping tool removed?
The latest bullets for 300 BLK
180 gr Sierra 220 gr Sierra and 170 gr Sierra