180 rifle in 300 blackout

A conversion to 300 blackout is really just a matter of swapping the factory .223 barrel for any 300 blackout barrel with the correct gas port spacing for a carbine length gas system. If you want to use a barrel set up for a pistol length system, you'll have to modify a factory piston, I'd think, as no one offers a pistol length gas system for the 180 pattern rifles.
 
There is at least one guy on here that has done it. I recall he had to do a lot of fiddling to get it running right but was happy in the end. Definitely an interesting conversion to me.
 
A pistol length gas system would be a necessity

Only if you want to run subsonics with certain powders. Carbine length will run Remington and Hornady subs just fine. That is in an AR though... Maybe I'm missing the point and you are saying it's what you want as stated in your first post..?
 
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