Think this is a full bore thing. Did on some of the guns I owned. Definitely helps with a wooden stock. Helps keep the action in the same place in wet and dry conditions that can swell the wood. Can't say it does anything with a synthetic stock and never found an air rifle to need it.
EV2 Mk3+Sightron SIII 10-50 x 60 LRIRMOA / Bushnell 8-32
Theoben Rapid 12 FAC
GROWING OLD IS NOT FOR SISSIES