All right, just wanted to finish up this post with the resolution, Took the 260 down to the range after doing some more work on the pillar to relieve the "drag" on the sear. wound up taking a bit off the back of the sear as well, just to ensure I had plenty of clearance. Got back to the range and had 0 misfires out of 10 shots. It's all good to go!!

Thanks again to everyone here!