газова трубка зі ствольною накладкою
handguard
lower handguard, forend
A tube / A-tube
transmitting-receiving tube (TR tube)
gas plug and tube assembly
gas escape tube
forearm with gas tube assembly
shock tube with detonating driver gas
gas tube
gas gun; (tear) gas launcher
land-based upper layer (LBUL)
Sea-Based Upper Layer (SBUL)
upper air fallout
upper deck
upper layer
upper sideband (USB)
upper glacis plate
adjustable upper sling swivel
upper ball race
upper center crankshaft bearing
upper edge of front sight
upper front crankshaft bearing
upper front plate
upper hemisphere
upper insulator gasket
upper motor lubricant
upper proximity dot (of a gyro gunsight)
upper rear crankshaft bearing
upper sling swivel
upper tank
upper time ring
upper water tank