eXperimental Material Rifle-500
What if the bullpup weapons met the Anti Material Rifles? You'd get this; the eXperimental Material Rifle-500 or XMR-500 for short. This compact, bolt action Anti Material Rifle is chambered in .50 BMG, with variations for Anti Personal, Anti Tank and with a Enhanced Combat Sleeve for improved ranges. The XMR also comes with BUIS (Back Up Iron Sights), in case the 6X scope can't be used in close quarters, plus a bipod for stable aiming.
This model is made for my friend, who has a fictional PMC called the General's Reservist Army or GRA for short. You can find him here: http://suomipoika11.deviantart.com/