Finally got my 9mm AR set up

[HKShooter65]

The MPX? I'm pretty sure that's a different beast, not an AR15 rifle. Pretty sure no buffer tube from the pictures. They look awesome. I was tempted....

Yup.
MPX is unique and original.
Short stroke piston with propellant gas bled off right in front of chamber.

No buffer tube. 2 actuator springs are an integral part of the bolt group that is piston driven.

Engineered to handle wide range if barrel lengths, ammo types, suppressors etc.

A specialized variant of piston AR.

IMO a great feat.

 

[APynckel]

Me too but I can't decide which way to go.

Yea. Make another 9mm dedicated SBR, or find some way to adapt my current lower....