P-F timing is always uncanny, I've been mulling this over for weeks as I plan to configure some type of HD setup. I've been stuck on barrel length and weighing the pros/cons of an 11.5" pistol build or a 16” carbine. Admittedly I'm 'trying' to keep it cheap-er, like PSA or MP Sport II cheap, but at those price points trusting a 'cheap' 11.5" upper concerns me. I've had a few years experience with an MP Sport II with stellar performance so I'm leaning that direction.