Shadow Systems- MR918 (G19gen4) Frame w/Magwell & Locking block

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Product Overview

THIS IS AN FFL ITEM.  After placing your order, you will be contacted by our sales group to provide FFL information.

SHADOW SYSTEMS – MR918 Frame – Compatible with G19 Gen 4 slides


Compatible with existing Glock Gen4 G19 holsters, magazines, and accessories

Designed to dramatically reduce recoil and muzzle flip

Contoured frame sits low in the hand

Features double undercut trigger guard

3 interchangeable backstraps supporting high, neutral, and low Natural Point of Aim

Gently extended beavertail prevents slide bite

Aggressive grip texture on key surfaces

Included locking block and magwell extension enables faster reload under stress

Controllable recoil permits fast hits.  Fast hits win fights and win matches.  With this in mind, we contoured the frame to sit as low in the hand as possible.  The trigger guard is heavily undercut, and the backstrap is reduced at the web of the hand.  With the pistol now low in the hand, we gently extended the beavertail to prevent slide bite, but not enough to project unnecessarily and compromise concealment.  Lastly, we added aggressive texture throughout the contact surfaces.  Our texture is designed to give you the grip you need, but not wear holes in your hands or your clothes.

Our interchangeable backstrap system eliminates the outdated “small, medium, large” approach and instead focuses on Natural Point of Aim.  NPOA is taught in all the shooting disciplines and describes the process of positioning the body to place the sights on target in a “natural” or “relaxed” position.  The same principals apply in the grip of a pistol.  Our pistol includes three backstraps, each of which fundamentally changes the feel and natural point of aim of the pistol.  The pistol comes with the #2 Neutral backstrap pre-installed which accommodates the vast majority of shooters.  The flatter #1 backstrap depresses the muzzle of the pistol, and the higher #3 backstrap raises the muzzle of the pistol.  Pick the one that allows you to point the pistol like you point your finger.

Lastly, the pistol includes a magwell extension that can be added to the frame for those desiring a faster reload under stress.

Restrictions: By buying this item from Shadow Systems, the Customer certifies that the Customer will comply with any and all requirements imposed by applicable U.S. federal, state, and local laws, regulations, and administrative policies.


  • Serialized frame with aggressive grip texture
  • Three interchangeable backstraps: high, neutral, and low
  • Backstrap tool
  • Magwell extension


(3 reviews) Write a Review

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  • 5
    MR918 Frame

    Posted by YOSHI on Nov 4th 2021

    Definitely an upgrade to the factory glock gen4 frame. Great grip texture over factory. Overall fit and finish is excellent.

  • 4
    The holes

    Posted by Willie Pittman on Nov 1st 2021

    The holes were slightly off or under sized. I but everything fits and works

  • 5
    Shadow Systems MR918 Framw

    Posted by Justin on Oct 26th 2021

    Frame was just as described, came with locking block and matching magwell. I was able to quickly and easily assemble the frame with OEM Glock parts. Also fast shipping!