Bergara B14 in manners TCS

You might have to carefully take a file to the catch and slowly fit it till it clicks in, I had to do something similar with mine to get them to lock into my hawkins with the longer catch. Your other option is look at the L3i mags with the adjustable catch, not the cheapest option but nice since you can make them fit any bottom metal.
 
Not a Bergara B-14, but I’ve had half a dozen Manners stocks (using their mini chassis) and 1 or 2 needed a slightly shorter mag latch. I tried 5 or 6 mags, and none of them could seat. If you contact manners, they will send you a few various length latches to try (I’m just assuming you have their mini chassis). Or as said above, you can incrementally file down your existing latch.

First though, it might be good to check with a few different mags to make sure it’s not a mag problem. I had a P-mag AICS-L that was molded poorly. All my metal AICS & accurate mags latched fine (different stock than the ones mentioned above), but that one Pmag wouldn’t work.
 
You might have to carefully take a file to the catch and slowly fit it till it clicks in, I had to do something similar with mine to get them to lock into my hawkins with the longer catch. Your other option is look at the L3i mags with the adjustable catch, not the cheapest option but nice since you can make them fit any bottom metal.

You might have to carefully take a file to the catch and slowly fit it till it clicks in, I had to do something similar with mine to get them to lock into my hawkins with the longer catch. Your other option is look at the L3i mags with the adjustable catch, not the cheapest option but nice since you can make them fit any bottom metal.
I have an L3I mag. It works but once I adjusted all the way up it won't budge back down. And I need it to move just a little. They are not made as well as they vudoo plastic mags. Which will seat but don't feed well in the bergara/tcs setup. And theybare not easy to get free. The rimx takes the cake but haven't tried those yet.

The L3I mag drops flawlessly. But if I load 5 rounds the 2nd one won't pick up. If I load 10 the 3rd round from bottom won't pick up thr rim but mashes the head.