Well the Ar system has quite evolved from what was 30 years ago. The M4 SOPMOD package was really a great idea and a real performance booster:
With "shorty" I guess you think of a 14.5" or 16" M4 clone? Or do you want to go the short-barreled rifle route and get a 11.5"?
There is so much stuff out there, but since you mention a possible short "no-ban" time frame, I would get either the recommended LMT Upper receiver from Grant and ask him (give him a call!!) if he can send your firearms dealer a matching lower receiver (all you have to do is put them together) or, the simple way, a complete Colt LE 6920 carbine. I would go the Upper/Lower route, since it is easier to customize you prefered buttstock, trigger, etc. Another guy I have had VERY good experiences with is Chen Lee
CLTactical
I can only tell you about my dream carbine:
*LMT 14.5" upper with permanently (due to law) fixed Vortex flashhider (has the 1/7 spin barrel so that the new, effective 75-77gr. bullets are stabilized) and LaRue railsystem mounted
*LMT made lower receiver with LMT Crane stock (great cheekweld!!) from here:
http://www.ar15.com/forums/topic.html?b=7&f=21&t=221646
Quote:
LMT is not ready to part with stripped lowers quite yet. I can get LMT marked complete lowers with LMT M4 stock, buffer spring etc, ready to drop your upper on. $330 delivered.
Just add $199 for the SOPMOD. I will ship the lower with both stocks.
Yes, these are LE Marked. Kinda of a good reminder on how Clinton and congress screwed us.
*Aimpoint M2 in LaRue mount or Eotech 552 in LaRue mount or Trijicon TA31 ACOG
*LMT or Troy flip up, back up sight
*Tango Down grip and vertical foregrip
*a carbine class held by Pat Rogers or Jeff Gonzales!!
Have fun choosing!!