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The manufacturer states: The Adams Arms Left-Handed P Series Adjustable Micro Block Piston Kit will work with .223/5.56 x 45 mm NATO. For other calibers, please contact Support. It should work fine with 300 Blackout but I would still recommend reaching out to Adams Arms directly for confirmation.
Unfortunately, we do not carry the Adams Arms P Series Adjustable Micro Block Piston Kit in a left handed configuration with a pistol length gas system.
The Adams Arms Left-Handed P Series Adjustable Micro Block Piston Kit is carbine length.
Yes. This Adams Arms Left-Handed P Series Adjustable Micro Block Piston Kit includes the piston gas block. You will need to purchase a piston BCG separately. We do carry Adams Arms Piston Kits in right handed versions that range from pistol length gas systems to rifle length gas systems. You can find them by using the following link:
https://www.opticsplanet.com/s/adams-arms?_iv_categories=ar15-upper-receiver-parts