Smith & Wesson M&P Shield Locking Block
Factory OEM Part #422140000
Genuine Smith & Wesson factory locking block for M&P Shield pistols. Critical frame component that locks the barrel and slide together during firing.
Key Features:
- Factory OEM quality and precision
- Precision-machined steel construction
- Critical for safe operation
- Direct replacement part
- Heat-treated for durability
Compatibility:
✓ Compatible with:
- M&P Shield 9mm (1.0 & 2.0)
- M&P Shield .40 S&W (1.0 & 2.0)
Function:
The locking block engages the barrel locking lugs and locks the barrel to the slide during firing. After firing, it cams the barrel down to unlock the action for cycling. Critical component for safe and reliable operation.
When to Replace:
Replace if the locking block shows cracks, excessive wear, or deformation. This is a high-stress component that should be inspected regularly, especially on high-round-count pistols.
Maintain safe operation with genuine Smith & Wesson factory parts.