Remington Model 40X Target Rifle Exploded View
The Remington Model 40X small-bore target rifle was introduced in 1955. Chambered for the cal. .22 long rifle cartridge, the Model 40X is of single-shot type with speed-lock firing mechanism. The bolt has 2 large locking lugs. The upper lug engages the forward edge of the receiver bridge, whereas the lower lug is housed in a mortise cut into the bottom of the receiver.