PRI Gas Block With Top Picatinny Rail

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Stock Status:

Out of stock

PRI Gas Block for AR15, M16, M4, M4A1, for .750 barrels. Same plane as flat top upper receiver!!
This Barrel mounted gas block has a 2 1/2" top rail same plain as the receiver. The rail is constructed of light wait hard coat aluminum. This gas block weights 2.5oz. Gas block fits over a .750 diameter barrel. Block locks into place with 2 crossbolts the same as the original PRI gas block front sight.
This gas block is compatible with the use of a milspec rear sights and the following RAIL MOUNT front sights: PRI, Troy Ind, BCM®/Troy, MI-FFR, MBUS
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit***

12 Reviews

  • 5
    Perfect fit

    Posted by David Whitaker on Nov 17th 2016

    Just what I was looking for, wanted to put on flip up sights for use with hologram sight. Fit perfect, no problems installing!!!

  • 4
    Gas block

    Posted by Thomas Dozier on Sep 22nd 2016

    Have not used yet , a stock item.

  • 5
    Precise Fit

    Posted by anonymous on Sep 22nd 2016

    Perfect fit and alignment , just the right amount of clearance for a snug precise fit. Quality Part.

  • 5
    DIY Build Projects

    Posted by Rudy Pacumbaba on Sep 3rd 2016

    Great quality gas block. Will use on all my builds.

  • 5
    PRI Gas Block With Top Picatinny Rail

    Posted by Robert Buxton on Apr 26th 2016

    works very well and is rail height

  • 5
    Good stuff

    Posted by Derek on Apr 26th 2016

    Shipped quickly. Easy to install. Works great.

  • 5
    This is a great piece

    Posted by Kyle Jolk on Mar 14th 2016

    Just the right part I was looking for, and lines up great with a BCM upper.

  • 5
    PRI Gas Block With Top Picatinny Rail

    Posted by Mike Higashi on Mar 14th 2016

    Outstanding product, perfect machining and easy to install and aligns well with the top rail of the handguard, it also comes with 1 shim if needed. I am having an issue with gas port alignment with the barrel/gas block port due to having the handguard cap on. I might have to remove the cap and buy a free float handguard. Fast Order confirmation and quick shipping. Great job BCM!!

  • 5
    Gas Block

    Posted by Travis Hubbard on Feb 13th 2016

    let me start off with damn! this thing really blew me off my feet when i first held it! things the perfect weight, no flaws and perfect gas block. havent used it yet since im still building the rifle but i have no doubt in it. Fitment was great. its stylish and it IS flush with the flat top rail on my Anderson lower and Aero Precision Upper build. only issue i had was that my Del Ton gas tube was a tight fit into the hole and the gas holes didnt quite line up after throwing the roll pin by a few 32's it looks like...but that could be the tube. either way im hoping it doesnt let me down! good product and great shipping and handling!