Does anyone have one, And would you recommend it. This is the drop in FF one i'm talking about. 

I haven't used the troy but I have a Daniel Defense Omega rail which is FF without altering barrel nut or hand guard cap etc. I like it a lot and would recommend.

 

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One of my uppers is running a Samson Evolution rail that is FF and uses the mil spec barrel nut too. It has anti rotation tabs too which is also important.

I haven't used the troy but I have a Daniel Defense Omega rail which is FF without altering barrel nut or hand guard cap etc. I like it a lot and would recommend.

 

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Agreed. I like the DD Omega rails a lot.

 

I don't have the Troy Delta Rail but u have 3 of the Alpha rails and I like then a lot. They use the standard barrel nut (which is great for NJ with pinned muzzle devices). All you need is an angle grinder/dremel to cut away the delta ring and shape the FSB to fit under the rail - takes about 20 minutes if you are careful.