Waiting for my Black magic cold blue for my modified FSP. So I can use the Taper pins instead if a low profile gas block with set screws.
I just finished installing my DD 9.5" FSP Lite Rail on my 10.3" SBR and it is sweet.
Can't wait to get the 20" done.
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You will like it , I love mine . I put a 15" trx Alpha on my 16" carbine for that dissy look , love the feel and its rock solid
Hey,
Do you have a picture of your 16" with the 15" Alpha rail?
I'm either going to get a BCM 14.5" or 16" mid-length. The 20" is just to long for my taste.
Troy Alpha 15" rail on a BCM 20"
Take ur pick 
Linear Mode
