| 摘要 |
A toy rifle (air soft rifle, BB-rifle) backlash vibration structure (a) which has a weight (3) directly stopped against the rear side of a piston spring (11) at the rear side of the piston (1) of the toy rifle to avoid piston damage while providing a backlash vibration to simulate a reaction force upon firing of a bullet, and a buttcap spacer (5) detachably fastened to the rear side of a receiver extension (2) and mounted with an adjustment rod (6) that is rotatable forwards/backwards to adjust the backlash vibration within a predetermined range from zero to the maximum.
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