M27 Infantry Automatic Rifle
The M27 Infantry Automatic Rifle ( IAR ) is a lightweight magazine-fed 5 . 56mm select-fire weapon based on the HK416 rifle designed and manufactured by the German company Heckler & Koch . 
<triplet> M27 Infantry Automatic Rifle <subj> 5.56mm <obj> ammunition <subj> Heckler & Koch <obj> manufacturer <triplet> HK416 <subj> 5.56mm <obj> ammunition <subj> Heckler & Koch <obj> manufacturer