Just some advice.
9mm builds are not as easy as 5.56.
They can have feed problems (and sometimes ejection problems).
Conversions/adapters/BS only make those issues worse.
Magazine related failures are the #1 cause of issues in any platform.
A dedicated Glock mag lower such as the
FM-9 is a worthy purchase and the LRBHO is nicely executed.
You're on the right track with the extended buffer, but that one is a single solid part.
The
FM-45 buffer is even heavier at 8 oz and has a couple moveable tungsten weights to help with bounce.
Verify the barrel has a proper feed ramp / cone. If not,
147gr flat points and defensive ammo may not feed.
Everything else looks fine.
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