Arms Unlimited has a small quantity (about 49 as of 27 MAY 2022) of the elusive Colt LE6920-FBP2 carbines. These carbines are equipped per FBI contract specification with a Geissele rail and Magpul Pro back-up iron sights just to name a couple of the features. There have only been two or three hundred (rough guestimate based on observed quantities released) of these made available to the market to date.
Here are some photos of my Colt LE6920-FBP2 for anyone not familiar with the carbine.
The FBP2 carbine is one of my top three favorite rifle/carbines along with the 6920-EPR and the AR-15A4.
You can get yours here at this link: https://www.armsunlimited.com/Colt-M4-Carbine-Federal-Patrol-Rifle-p/le6920-fbp2.htm?CartID=1
The Colt AR-15 Resource 
Looks great, without any negations what are the differences between this weapons and the current EPR? Is the Geissele that much better than the Centurion rail.. ?
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The configuration of the Colt FBP2 was specified by the FBI for agents to purchase if they wanted to use a personally owned firearm in the line of duty. The Geissele rail is what was specified by the FBI. The Centurion rail on the EPR is Colt design specification.
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