Came to me in a bundle so don’t know much about the RIF. Possibly looks like the Specna SA FX 10 ? On 11.1v and 0.2g it’s showing 375fps and 1000 rpm 😳. Comes with all you see so all the mags and the battery and battery cover plus the sight oh and has Maxx trigger. 
 

It has a mosfet or ETU ( beeps when battery connects )  no idea how to program it. All working but only thing I’ve noted is when switching to full auto sometimes it shoots 1 or 2 semi shots then full auto. The trigger is very sensitive too so again probably down to controller settings. 
 

Great gun but no use to me as I’ve got my favourites I use so it’s up for sale at reasonable money. Price includes postage and can provide a video showing it on the chrono. Postage via parcelforce 48. Buyer to cover PayPal fees , Thanks