Tuning for Reliability

[kurusu]

Originally Posted by John Sabato

Failure to lock open with only one round in the chamber and an empty magazine inserted indicates either a holdopen that has restricted movement (rubbing on the right grip), or that the mainspring force is too heavy.

Sporadic failure to lock open with Winchester ammo is not uncommon. I only had 99% lock open when I used Portuguese military grade ammo.