Clean the recess on the inside of the magazine well with the alcohol cleaning pad provided. It is critical that this surface be completely clean and free of oil or other contaminates. If you have not been in the habit of cleaning this area regularly, it would be best to hit it with some gun cleaning solvent before using the provided alcohol pad. If you are typically very free with the oil, it may be best to start with warm soapy water or 100% acetone before finishing with the alcohol cleaning pad.

Extra double sided tape is provided in case you make a mistake on the first try at installing. If you find that the tape is not adhering very well, it is almost always because this area has not been properly cleaned. If you do try again with new tape, make sure that the mounting area is spotless and oil free.

Install the new magazine catch.

Press the magazine release button hard, almost like you are going to remove the magazine catch, but don’t remove it. Instead, slip the corner of the cleaning pad wrapper, folded over if it will fit, in between the bottom of the magazine catch and the slot for it on the lower receiver. Release the magazine release button leaving the paper in place. At the end of this step, the magazine catch should fully reseat into its recess, but be firmly biased upwards.

Push the top of the key on the key assembly down so that the tang extends from its bottom. Then, using a razor blade or needle, carefully remove the film from the adhesive on the key assembly’s sleeve. If the adhesive gets bunched up, use a razor blade or needle to push it back into place.

Holding the key assembly at an angle to the magazine well, insert the tang into the relief on the magazine catch. Then, slowly rotate the key assembly against the inside wall of the magazine well while pushing the key assembly down and into the magazine catch. Stop when the key assembly just begins to adhere to the magazine well side wall. The device should fit entirely within the recess in the magazine well and sit flat against it.

Do not press hard at this stage!

Inspect the key assembly to see if the top of its sleeve is below the top on the lower receiver. If it is not, carefully rotate the key assembly back a small amount, until the adhesive releases, and then again push it down towards the magazine catch while once again rotating it back to the magazine well side wall. Verify that the top of the key assembly is located correctly.

Once in the key assembly is in its proper place, apply strong pressure to the key assembly for a minute to help the adhesive bond to the magazine well. Then, insert the compression spring provided into the magazine well as shown. This will keep constant pressure on the adhesive while it sets up and greatly increase its bond strength.

Let the rifle sit for 48 to 72 hours with the spring left in the magazine well. After this, remove the spring and you are ready to rock.

Once fully mounted, the device can be removed by slipping the tip of a razor blade in between the magazine well wall and the key assembly. However, this will ruin the adhesive so the device will not be able to remounted without gluing it in place, as described below.

While the adhesive tape provided with the device makes a strong bond that meets the needs of the device, some may prefer to glue the device in place with the provided cyanoacrylate (super glue) for a truly permanent bond. In this case, the tape/adhesive on the key assembly must be completely removed. The best way seems to be to start at a corner and use your thumb to push and rollup the adhesive tape. WD-40 or 100% acetone and a cloth can also be used to soften the adhesive to aid in this process. Then, using alcohol, thoroughly clean the surface to remove any residue from the tape or any adhesive remover used. Like with the magazine well, this part needs to be completely free of any contaminates or residue that might interfere with the bond.

The installation procedure listed above mostly applies to this type of install. However, in place of the tape, use 3 tiny drops along each long edge, placed about 1/8 inch in from the edge, with 2 additional drops in the middle as shown in the adjacent picture. Mount it as described above, and hold in place for 1 to 2 minutes for the initial bond. Full bond strength takes 24 hours to develop. It does not need to be clamped in placed during this 24 hour period, although the device should not be disturbed or the rifle used during this time.

Attention to detail and being clean and careful is key for getting a good permanent install.