The Williams™ 1420 5D-SMLE  Receiver Peep Sight is specifically designed to fit the Lee Enfield Nos. 1, 4 and 5. Williams™ 5D-SMLE Receiver Peep Sights offer shooters unmatched open sight visibility at longer distances than standard fixed open sights. The Williams™ 5D-SMLE Receiver Peep Sight is compatible with a front fiber optic fire sight. Williams™ Fire Sights gather ambient light and reflect it back to your eye, enabling faster target acquisition. Williams™ Sights do not use artificial light sources to create their sight visibility, making them legal to use in states that do not allow artificial light sources on your firearm while hunting. 

This Williams™ 5D-SMLE Sight Set 1420 fits the following firearms:

• Enfield #1 Mark I
• Enfield #1 Mark II
• Enfield #1 Mark III
• Enfield #1 Mark IV
• Enfield #1 Mark V
• Enfield #4 Mark I
• Enfield #4 Mark II
• Enfield #4 Mark III
• Enfield #4 Mark IV
• Enfield #4 Mark V