Running a 300 BLACKOUT PDW in Full-Auto

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6 months 2 weeks
Submitted by megabasedman on
kak build

TL;DR; - The Q Shorty stock comes with a standard buffer, and will need to be replaced with a heavier buffer to run reliably in full-auto. MAXIM Defense saved the day.

Building on a KAK receiver set, which comes with an M-16 full-auto cut, is a great option for those on a limited budget and limited tools. The Q Shorty stock is expensive, and should come with an option for a heavier buffer from the factory. That said, I like the stonk. It deploys quickly, though not at the press of a button like the Honey Badger.  The 8.3" Ballistic Advantage barrel makes this a handy package for home defense or truck gun.

Reliability was lacking in full-auto with the stock buffer from Q--suffering from bolt bounce. It did perform fine in semi with the stock setup. I ended up going with the H3 buffer from Maxim Defense, as opposed to something more Gucci like the JP Silent Spring.  Their roller-delayed option looks interesting as well, so may have to try that soon.

The Dead Air Sandman L adds some weight to this package but sounds excellent with subsonic ammunition.

For select-fire conversions, I can't recommend the KAK parts kits enough. It went in easily and haven't had any problems with hundreds of rounds so far.

Build List

  • Ballistic Advantage Hanson Barrel 8.3 Inch
  • Q Shorty Stock
  • Maxim Defense H3 PDW Buffer (4.85 oz)
  • Sons of Liberty Gun Works BCG
  • KAK Receiver Set and Handguard (7.2 inch)
  • KAK M16 Parts Kit
  • Dead Air Sandman L
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