We built up one from our inventory and can confirm:
1: Locking block out of spec with frame, we used a file to add a taper to the frame and were able to install the locking block easily after that.
2: Jig might be a little off, making the locking block and trigger pin slightly higher than they need to be, which put our locking block rail system at a very slight angle and leaves it out of alignment with the rear rail module. We ended up taking a file to the underside of the front rails at an angle that helps compensate for this, which seems to solve the issue.
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