There is very interesting thread about AR-15 rifles on Remington 870 forum.

Here is aRue Tactical AR-15 from that thread:

LaRue Tactical AR-15

LaRue Tactical AR-15

LaRue Tactical AR-15 Accessories

LaRue Tactical AR-15 Accessories

LaRue Tactical

LaRue Tactical

And another interesting AR-15 rifle from that thread:

AR-15 Rifle

AR-15 Rifle

AR-15 Rifle

AR-15 Rifle

More photos coming soon…

Related posts:
Top 5 Tactical Accessories for AR-15
Must have AR-15 upgrades
List of the Best AR-15 Upgrades