It comes with everything in the picture, plus the sling swivel which can by used to remove the whole rail system, or you can use a screwdriver, I recommend the screwdriver.
Description provided by ARMS site: Fits flat-top equipped weapons with carbine length gas systems. The #50™ is a slim line S.I.R. ® featuring a bi-level top dovetail rail. The forward rail section is lowered to allow co-witnessing of heads up display type optics when used in conjunction with our #40™ series rear sights and a standard height front sight post. Installation requires the removal of the delta ring.
Wt. 15.0 oz*
The 1,2,3 rails and sling swivel are included with the SIR system. Rails can be removed/added as needed.
This is in like new condition, no mods, no damage from use or installation.
Also, a RRA Like New Tactical Entry Stock Complete- 55.00
Or will trade both for for compact 45ACP/10mm/40cal
Will add cash where needed.
Paypal ok, + 3%