Anti-rollout insert

An anti-rollout device for closed-bolt paintball markers.

Print with Ninjaflex; probably want 2 solid rectlinear layers. One layer might also work if it's nice and squished.

https://www.youtube.com/watch?v=mEqfS6cG6Yo

Edit: You may need to adjust settings to match your particular marker. For instance, if you're using a Freak back, the landing on that isn't quite as robust because of the insert, so you might need to increase the OD and lip thickness to make sure the insert doesn't work loose.