DD FF Rail Differences?

[M4Fundi]

I searched... I'm not interested in length, wt, but what makes the DD rail an RIS, M4, Lite, etc. ??? Is it how they connect to receiver or what?

[bkb0000]

indeed.. the Lites use a boltup plate. the RIS has a slightly sturdier boltup plate, and has a removable bottom. the M4s use a threaded ring. the Omegas clamp to the OEM barrel nut. the Omega-Xs clamp, but use a proprietary barrel nut (the Lite nut, i think i've heard).

[M4Fundi]

What would be the pros/cons of these based on the bolt up methods for someone trying to decide on which one to get? Is the RIS "more" combat worthy or just very M203 friendly?

[bkb0000]

not sure, to tell you the truth. i've owned Lites, M4s, and a RIS... i liked them all just fine, but i have an affinity for the M4s. just an aesthetics thing, i guess. some will say the Lites are more secure, and i would guess that was their intent.. i've heard tell of M4s coming loose, but only very rarely, and were probably not installed correctly. the lites aren't fail-proof either, in this regard.. by the time your guard has rotated enough that the bolts keep it from rotating further, your gas tube is already perforated- so this isn't much of an actual benefit, near as i can see.

just go with whatever gives you wood. they'll all be good to you.

[Impact]

I really like the Omega X and RIS myself.
The Omega X has a very slim profile.

[M4Fundi]

Thanks for the info... I'm just trying to figure out which one "gives me wood":p

[Col_Crocs]

I have both the omega and the Mk18 RISII. Between the 2, I perfer the RIS hands down. It's the best of both worlds IMHO. The Rigidity of the Lite's bolt up system with the added security of anti-rotational tabs on the bolt up collar/ring and the 2 piece design of the Omega. I really like the idea of being able to take off the lower rail for cleaning without having to remove and later re-align the entire rail. It's also a lot lighter than I expected.
If you dont need the length, the Mk18 works on a middy. Depending on your GB though, you may have to dremel the bottom a bit to clear the rail like I did. And ofcourse, being mostly exposed, I would recommend you pin it as well. The new DD pinned GB should work perferctly without any modification if youre willing to wait.