 Here we have a metatactical Apex MP2 the world's first pistol to rifle bullpup Very easy to install use the MMP 2.0 swap out the 4 inch barrel for a 16 inch barrel inserted in very lightweight polymer this one's in gray other colors are available it has an angled foregrip here a thumb stop 16 inch barrel ambidextrous chargers meprolite M21 very easy and accurate shooting bullpup that makes range time a ton of fun