Trijicon and XS make front sights that epoxy over the front bead. The rear sights require drilling and tapping the receiver to install the ghost ring. LPA also makes rear ghost ring.
Another option would be purchasing an 870 barrel with rifle sights. XS makes sight set that replaces the std front sight post and rear notch.
I will post some links...
Here is the XS shotgun page: http://www.xssights.com/store/shotgun.html
Here is a link to the Trak-loc set: http://www.brownells.com/.aspx/pid=12522/Product/REMINGTON_TRAK_LOCK_trade__II_GHOST_RING_SIGHT_SET
Here is a link to the LPA rear ghost ring: http://www.midwayusa.com/viewproduct/?productnumber=471336
Another option would be purchasing an 870 barrel with rifle sights. XS makes sight set that replaces the std front sight post and rear notch.
I will post some links...
Here is the XS shotgun page: http://www.xssights.com/store/shotgun.html
Here is a link to the Trak-loc set: http://www.brownells.com/.aspx/pid=12522/Product/REMINGTON_TRAK_LOCK_trade__II_GHOST_RING_SIGHT_SET
Here is a link to the LPA rear ghost ring: http://www.midwayusa.com/viewproduct/?productnumber=471336