Rail Tactical

how to install a free float tactical rail on AR 15?

how to install free float hand rail all the way to the end of the barrel, probably exposing only 2 inch of the barrel and removing front iron sight. I’m just curious about the gas block if the iron sight is removed. example rifles are the ones they use at Magpul?

Alright here’s the deal, as other posters have mentioned, you’ve got two routes you can go, and the bad news is that both of them kind of suck. Also, for the look youi’re going for, if you’re using a carbine barrel (16″) use at least a mid-length (8.5″ or more) rail, or if using a rifle (20″) barrel, use something over 14″ (which are very hard to find, so hopefully you’re using a carbine length).

Route one (equipment needed: vice, upper receiver block (to hold upper receiver into vice), armorers wrench, punch set, penetrating oil, hammer, lots of patience):

tap out the gas tube roll pin (the tiny pin holding the gas tube to the front sight base), and tap out the two front sight pins (on the underside of the front sight). Both of these are a huge PITA. Pull the gas tube out of the receiver, and remove the delta ring assembly. Once this is done, you pull the front sight base off, and replace it with a low-profile gas block, and then install it as per manufacturers specs (which generally entail replacing the roll pin and some form of gas block pins similar to those you tapped out on the underside of the old sight base).

From what I’ve seen of most rail systems, they will replace your old delta ring assembly where it screws onto the receiver (an armorers wrench is needed to twist it off). Depending on the design of the free float rail, you will put the rail on either before or after the gas block, so consult with your particular rails instructions on that. If you don’t have adequate tools and patience, I’d strongly recommending a gunsmith for this, as I do have tools and the knowhow, and it was still terribly troublesome.

Option two: Secure your upper receiver as to remove any movement, and cut off the top half of the front sight base (above the gas tube obviously). If done properly, it should be low enough to allow the rail to go over it. Be careful not to pivot the front sight base around the barrel any in the cutting process, as it will cant the angle of the gas tube where it meets the bolt carrier group causing you reliability problems. Generally the front sight taper pins are in there harder than you’d believe possible though, so this will not be a problem.

As to the 2″ of the barrel that you requested, that’s going to be one long rail. The Magpul Rep guys use a lot of SBR’s so unless you’re willing to go through the headache of getting a registered SBR (short barrel rifle) with a form 3, the closest you can go is to get a 12″ rifle free float rail and mount it to a 16″ carbine barrel, the difference obviously being 4″. 12″ rails are generally about as long as they are made with the exception of the rails which have slots for the front sight base to go in, then continue past it.

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