There was only 1 rifle murder in Nebraska in 2006, so there can't be a second-place make/model.
If you are speaking of rifles used in homicides nationally, #1 is the lowly .22LR, if I remember the results of the BATFE Youth Crime Gun Interdiction Survey results accurately.
Ah, yes. Here we go...looked it up.
The most traced rifle was the lowly .22, not any sort of "assault weapon," even despite the inevitable Von Restorff bias in the trace data. The most commonly traced long gun was the 12-gauge pump shotgun, i.e. hunting style, which (unlike a self-loading rifle) will still function if sawed off, making it much easier to conceal than even a folding-stocked rifle.
http://www.atf.gov/firearms/ycgii/2000http://www.atf.gov/firearms/ycgii/2000/generalfindings.pdfHere is the caliber breakdown for long guns (rifles AND shotguns) in the BATFE data:
Table 4: Top Ten Long Guns by Type and Caliber/Gauge
by Age Group of Possessor
Long Gun Type and Caliber - All Ages
Shotgun 12 GA...........6,854...............35.5%
Rifle .22...............4,076...............21.1%
Rifle 7.62mm............1,729................9.0%
Shotgun 20 GA...........1,277................6.6%
Rifle .30-30..............616................3.2%
Shotgun .410 GA...........615................3.2%
Rifle .223................599................3.1%
Rifle 9mm.................412................2.1%
Rifle .30-06..............410................2.1%
Shotgun 16 GA.............409................2.1%
Top Ten Long Guns......16,997...............88.0%
All Long Guns..........19,311..............100.0% A rough guide to the rifle calibers, for any non-gunnies in the thread:
.22 - mostly not "assault weapons" (rimfire target rifles, squirrel hunting rifles, etc.).
7.62mm - a mix of hunting guns, non-"AW" target guns, and some "assault weapons"; .308 Winchester is 7.62x51mm, and includes tons of hunting guns, plus FAL, CETME, and HK "assault weapons"; 7.62x39mm includes the Ruger Mini Thirty deer rifle, the SKS (either an "assault weapon" or not, depending on who you ask), and most civilian AK lookalikes.
.30-30 - hunting weapons exclusively; there are no "assault weapons" in this caliber.
.223 - a mix, but mostly "assault weapons"; this caliber includes the Ruger Mini-14 and the AR-15 platform. This is the least powerful of common centerfire rifle calibers, FWIW.
9mm (pistol caliber) - this includes carbines that fire the little 9mm pistol cartridge, and would include a mix of non-"assault weapons" (Marlin Camp Carbine, Ruger PC9, etc.) and "assault weapons" (the old Feather AT-9, civilian Uzi lookalikes with shoulder stocks).
.30-06 - high-powered hunting rifles (most popular deer caliber in America); mostly bolt-actions, but also includes some semiauto Brownings and the Remington 7400 (not "assault weapons") and the 1930's vintage M1 Garand (either an "assault weapon" or not, depending on who you ask).
So I don't think AR-15's are very high in the crime stats (the overwhelming majority of AR-15 type rifles are .223 Remington, which accounted for barely 3% of long gun traces).