There's so many options, if you want a drop I unit;
KAC RIS/RAS
DD Omega 7.0
Surefire M73
Troy Battlerail
If you're up to removing the handguard ring and want to extend the handguard;
KAC MRE
DD RIS II FSP (I have specifically this right now)
DD Omega-X 12.0 FSP
VTAC/Troy Delta Rail
Amongst the slew of other options, most of which are Chinese garbage.
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[DD RIS II FSP]
This is what you want, OP. I have one I could sell you, if you'd like, but it's black
how hard is it to replace the barrel nut, for someone who has never done it??



























