With no mag in the gun, hold it open, and while the toggle is back, stick a finger in and manually raise the hold-open up on the back end to see if, once the toggle is carefully released, it will catch the toggle and hold it back. Upwards pressure must be maintained. and above all, watch out for the toggle catching your finger on closing! Very sililar to M1 Thumb...
That will helpp narrow it down to a back catch lever or a bad spring (or bad mags.).
dju
|