щілинний проріз
spiral parallel groove
barrel groove
breechblock-stop groove
cam groove
circular groove (of ammunition)
crimping groove
dismounting groove
vertical oil groove
extraction groove
extractor groove
finger groove
four-groove barrel
groove for coupling
groove
permanent slot
indexing slot
time slot
advance slot
cross slot
U slot of piston
valve head slot
ejection slot
end slot
extractor slot
half slot
guide slot
multi-slot muzzle brake
slot cooling
key slot
vision slot
terminal slot cover
longitudinal slot