Description
PWS builds its uppers around a long-stroke piston instead of direct impingement — less gas and fouling back into the receiver, which matters more on a short 300 Blackout than on anything else. This is the MK109 Mod 1-M with a 9.75″ barrel.
- 300 AAC Blackout
- 9.75″ barrel
- MK109 Mod 1-M configuration
- Complete upper receiver
Order online, or call the shop if you’d rather talk it through.

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