This is the factory Heckler & Koch magazine catch spring for the HK416 and MR556. It returns the magazine catch so magazines lock into the lower receiver. Replace a weak or lost spring with this part. Compare it with your existing part or the manufacturer's parts diagram to confirm it matches your firearm before ordering.
- Part: Magazine catch spring
- Fits: HK416 / MR556
- Brand: Heckler & Koch
- UPC: 642230251335
