AR-15 to 9mm Glock Conversion Block

AR-15 to 9mm Glock Conversion Block


In stock

The Sylvan Arms 9mm Glock Conversion Block converts your AR-15 lower to a 9mm Lower using Glock magazines.

Our Glock Conversion Block is built to handle any standard mil spec lowers with most 9mm uppers.
Works with Glock 17 and Glock 19 magazines.
Built of 60601 aircraft grade aluminum.
Does not include last round bolt hold open.
100% Satisfaction Guarantee.
limited lifetime warranty
Designed, built, and assembled in the USA.

Check it out in action:

5 reviews for AR-15 to 9mm Glock Conversion Block

  1. Janz

    I’ve used dedicated glock-mag lowers from QC10, PSA, and New Frontier and have also install the TorkMag adapter so I’ve been around the block a bit with small-frame Glock use in AR form factor. I saw Primary Arms had a unit on sale and picked one up to test out. Frankly I was expecting at least some fussiness, however, this conversion block ran flawlessly with the 9mm upper I took out to test it with. Not one malfunction at all.

    Ran 115gr bulk Remington, some Federal bulk 115gr, some Blazer 147gr, and some PPU 147gr JHP. All worked w/o issue.

    Getting used to the position of the magazine release was a bit awkward (dedicated lowers and the TM kit all use the standard mag-release location), however, grabbing the mag and pulling the release with the off-hand index finger was easy to get used to. Mags do not drop free (at least in the one I picked up).

    I have to say I’m very pleased with this unit and have recommended it to my gun-owning friends that were looking into a glock-mag-fed 9mm AR, but didn’t want to buy a new dedicated lower (or mess with having to modify your mags like the TorkMag unit).

  2. Darryl

    It works well, but man is it tight to get in and the after market mags I am using are also a very tight fit. Just a hair more room would be great.

  3. Bill D (verified owner)

    I’ve shot about 500 rounds through my 9mm build, not a single malfunction. Ive used Glock, KCI and ETS with no issues. All mags fed and ejected normally. Hope you guys make one for the M&P9/40.

  4. Stan

    This unit is AWESOME!!!! I have two of them in different manufacturers lowers and they have been 100% in both lowers. Shot hollow point, fmg, flat point and they all have functioned perfectly. The ETS mags drop freely, the only ones that are a little tight are the factory Glock mags. I like the ETS mags better anyway.

  5. RtoR

    I purchased this to convert a 556 AR lower to 9mm. Works fantastic. Put 9mm barrel on an old 556 upper and added a $109 TRYBE Defense Milspec 9mm BCG and it simply works perfect. Barrel $139. This mag-well conversion and $109 BCG and I have a 9mm AR from an old 556 setup.

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