AR-15/M16 PICATINNY RAIL ADJUSTABLE GAS BLOCK Reviews & Ratings

Double Star's Picatinny Rail Adjustable Gas block is in house from 6065 T6 aluminum and finished with a black hard coat anodize. The stainless steel adjustment screw is held in place with a brass tipped stainless steel set screw. The brass tip prevents damage to the threads on the adjustment screw.

SPECS: Material: 6065 T6 Aluminum. Inside Diameter: .750.

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Needs work to be righy

I put this gas block on a palmetto 308 18inch midlenght upper. With the adjustment screw all the way in(the gas block should be closed and the rifle shouldnt cycle) the gun still cycled like it was seeing full gas volume. Dissassembly and inspection revealed the adjustment screw was actually smaller than the port in the block. So even with the screw all the way in, the gas simply bypasses the screw. I redrilled and tapped the adjustment screw hole and installed a larger (8-32) adjusting screw. Now it works like i want it to.

Is NOT reciever height for co-witness

Got this for a build with the intention of using Troy sights on it (the gas block gets VERY hot so do not use plastic sights on it!) it is appx. 1/4" lower than the receiver so at 25yrds you are shooting about 3' high. the problem is I can not find a 1/4" riser to correct this issue (only 1/2") so I am going with plan "B" and getting a YHM front sight/gas block combo but now I will have a Troy front sight with no rear to go with it.