So I dove in and just ordered a steel SS kit that includes a PLA "centering block". This block obviously doesn't fit all the way down the lever, slot is too small and narrow, so does it just sit on top before the bend? Does it need to be heated/softened and shoved down further on the lever? I can't find a photo or instructions for this little part.
Centering Block on SS, how to use?
Not heard of this before, but I'm guessing they are trying to keep the lever centered in the lower. Should not be needed with most lowers.
If you have a normal AR-15 lower, it won't fit. It only fits in the wider FA M16 style lower.