Smith Enterprise offers 3 x G6-A2 Vortex threaded (1/2" x 28tpi) for the AR15 barrel thread:
Only the 1001V states on the web site that it is for the AR15/M16. What are the other two for? What are the differences?
M240/M249 most likely for SAW...hence the designation.
Here are the current SEI part numbers for Vortex flash eliminator/suppressor interface units currently in production:
MODEL P/N Application
ARSR-700 1000V 0.30 cal AR-10/SR25/Bolt Guns
M240 1001AV M240B/MAG-58 GPMG
MK48 1041V MK48 LW GPMG
M60 1004V* M60 GPMG
M249 1001BV M249 SAW
MK46/Para 1040AV MK46 LW SAW & M249-Para
G6A2 1001V M4/M16/C-8 Family
G6A2D ------ Diemaco 10.5" bbl C-8 variant
M14DC 2000V M14SE/MK14 SEI (inc. modified M14/M1A rifles)
M14 OEM 2002V* M14
.458 SOCOM TBD* .458 SOCOM
FAL TBD Metric FAL
AK TBD AK47/AKM
*Denotes not suppressor capable
The purpose is pretty clear -- they're for the weapons indicated.
Thanks - I got confused because the M240 is in 308.... OOPs - I should have noticed.