I would trust my life to any of my 3 AR's. The M&P Sport, PSA upper/bolt combo on Mega Lower or the JD Machines upper/lower combo with Black Hole Weaponry barrel. I built the last 2 and reload for them too.
I understand things mechanical. I have been rebuilding motors of all kinds, carburetors, the odd electronic item and house electrical and plumbing. I do my own brakes so I guess I have to trust myself. Regular maintenance, checking for wear and keeping it all in manufacturers specs is the best thing you can do for anything mechanicals reliability.
It sounds so dramatic to say "trust your life" to this or that. Actually it sounds like a sales pitch to me.


Fight fire, save lives, laugh in the face of danger.

Stupid always finds a way.