Was looking at the Bushmaster M4, its a 14.5" barrel with 1.5" FS right? Why does the barrel have a contour to it instead of being straight? Which Bushy model is the 11.5 inch barrel with ultra long flash suppressor?
So, this is 14.5" barrel with FS?
Bushmaster 16" M4
And this is 16" barrel with FS?
Bushmaster 16" A2
Where does an XM15 fit in? Is it basically an M4 as well?
Okay let's see if I can explain this......
1. first the step-down, it's for the mounting of the military 40mm grenade launcher, or the "wanna-be Rambo" 37mm smoke/CS launcher....
2. the M4 ya have above is a 16 barrel w/ and A2 FS installed on it, not the true 14.5" M4 w/ standard A2 which would be "illegal" unless you have the SBR tax-stamp.
3. the second rifle has exactly the same length 16" barrel and indentical A2 FS
4. you can have a true 14.5" M4 rifle as long as you "permanently install" a Vortex G6, Phantom or other "long FS", making the total barrel and permanently mounted FS length 16+"
Hope this helps,
Just order the second pic'ed rifle from AIMsurplus.