заставати зненацька (кого-л.)
belt feed pawl spring / belt-feed pawl spring
belt feed lever pivot spring / belt-feed lever pivot spring
obtain surprise
take smb. by surprise
technological surprise
artillery fire surprise
surprise close-range fire
effect surprise
gain surprise
accomplish surprise
attain surprise
capitalize on surprise
exploit surprise
sacrifice surprise
surprise
surprise effect
surprise factor
surprise fire
surprise target
surprise attack
axle suspension spring
drive spring
drive spring guide
leaf spring
recoil spring guide
sear spring
single-strand, high-strength, spring-steel wire
spring breakup
spring mechanism
torsion bar spring
bolt handle spring retaining pin
cap retaining pin spring