What do ya want exactly...
but here's a bit of info on the UAR...
http://www.booliganairsoft.com/2013/03/aps-uar-urban-assault-rifle-aeg.html
ver 1 (rare or not so common) has battery up front like in review
ver 2 has battery at the back for the last 5 years or so
barrel is about 430mm ish
good spring tester gun coz QC spring
but std motor is lame cheapo one, struggles to pull/test over a m120 spring say
but very long trigger travel - bit sloppy coz 2 part v3 trigger plus linkage for bulpup design
can take short m4 mags if magwell modded slightly
or use UAR mags, but issue is magwell is not that deep so little support
(I'd forget using really big hi cap mags)
*** pictures in review are ye old photo bucket & won't display trying to view/zoom in on them ***
but might provide a bit of info to weigh up if plausible project
(personally - just slap on extra crap to make it look Halo/Nerfy than fuck about trying to reshell it)
in other words transform the UAR into a Nerf than try to jam the UAR into a Nerf
Taiwangun is best place to grab one if you decide to proceed
odd weird bespoke gun - I just use mine for testing springs
