Quoted:
anyone shed light on that handguard and bipod setup in that last picture? link to more detail maybe? also, is that pistol grip a "standard" ar10? (dont know a lot about ar10's - but want to learn)...

The final Artillerie Inrichtingen design is known as the Portuguese model AR-10. This final version incorporated all that had been learned to date about the AR-10, including infantry service rifle and field test reports. In addition to a heavier barrel with chrome-lined chamber, optional bipod, and the removable plastic/metal handguards of the Transitional model, the Portuguese variant had wider bolt lugs, a stronger extractor, a new simplified three-position gas regulator, and a cocking handle featuring a forward bolt assist.[33] It is believed that approximately 4-5,000 Portuguese variants were produced; nearly all of them were sold to the Portuguese National Defense Ministry by the Brussels-based arms dealer SIDEM International in 1960.[25] The AR-10 was officially adopted by Portuguese Hunter paratroop (Caçadores páraquedista) battalions, and the rifle saw considerable combat service in Portugal's counter-insurgency campaigns in Angola and Mozambique.[34

Quoted:
anyone shed light on that handguard and bipod setup in that last picture? link to more detail maybe? also, is that pistol grip a "standard" ar10? (dont know a lot about ar10's - but want to learn)...