I bought a 1301T year ago. I've had a problem with the lifter getting caught on the bolt release when the bolt is locked backed. I could push the lifter until it shifted sideways and got stuck. It has been getting stuck under recoil more often lately. I came up with a cheap fix today that I think has fixed it. Now I can't push the lifter down (gun is upside down) and sideways to make it stick anymore. In fact I can't budge the lifter at all. I'll try it tomorrow at the range.
My fix is to place an ordinary 1/4" flat washer on the end of the carrier bushing. It fits there like it was supposed to be there in the first place. Reassembling the trigger group is no problem at all with the washer on. It removes the slop of the lifter and keeps it from shifting sideways and getting stuck on the bolt release.
I took some short video clips of before and after on my phone but the files are too large to email to myself for uploading. If you want to see them PM me and I'll text them to you. Here's a few screen shots showing where the washer goes.
