On my rifles where the pins end up a little loose, I rub them with bee's wax, JZ
Exactly. On the other hand, if the pins were TIGHT in steel and wood, they would bind due to the warmth causing enlarging and stretching of the barrel in the sun, or from firing it.
Barrels warm up, sometimes excessively to where you cannot hold on for very long. This happens when shooting out in the sun on a long trail walk as happens at rendezvous at
times. Late August sun in 100F + temperatures out shooting in the sun tends to heat up the barrel, considerably. There needs to be "some" give in the length and even diameter
of the holes in the attachment method used.