Symptoms

After modifying the selector lever to work the the Daytona kit, you try pushing it into the correct hole in the receiver and it gets stuck.

Generally, it stops at one of two points:

• The lever stops moving approximately halfway into the receiver, right at or right above the trigger and trigger sear.
• The selector moves over the trigger and sear, but does not line up with the opposite hole and so cannot be pushed all the way into position.

Causes

The primary cause of this issue is the trigger redesign from WE Tech. The Daytona kit is designed for WE's V2 Open Bolt M4/4168/888 body. WE has released a V3 Open Bolt iteration. This new generation features substantial changes to their trigger box and trigger box internals, as well as changes to the original bolt carrier.

Most of these changes focus on the bolt lock mechanism, but the trigger and sear have also been redesigned.

Identifying a V3 Donor	Visual Aid
Check for a large, teardrop-shaped piece sticking up on the left side of the trigger box.
Check to see if the bolt catch is now much smaller on the inside (this identifer only works if you are familiar with WE's old bolt catch design
Check for a steel bolt catch insert on the bottom of the bolt carrier. The bottom carrier in the picture on the right is a V3. The top carrier is a V2.

If any of the above points are true, you have a V3 donor and will likely encounter the issue outlined in this article.

Because the Daytona kit uses the trigger from the donor, the Daytona sear no longer sits in the correct position in the WE trigger.

This problem is evident when looking through the selector holes in the lower receiver after you have installed the Daytona trigger box. You will see a portion of the Daytona sear partially obstructing the lower portion of the selector holes.

This obstruction then blocks the selector from passing through the receiver as it should. In most cases, it will hang up on the sear. In some cases, it may pass over the sear, but then be misaligned such that it cannot be pushed through the opposite hole.

Solutions

Currently, the only solution is to remove material from the bottom of the Daytona trigger sear.

Grind, file, or sand the bottom of the trigger sear until enough material has been removed that the selector can slide properly into the lower receiver.