If you have any doubts in your ability to perform the following actions, stop immediately and seek assistance from a qualified gunsmith. If you need clarification on any of the steps below, please contact us to speak with a member of our support team.
Always wear proper personal protective equipment (PPE) including adequate eye protection when servicing a firearm.
Properly seating magazines
Please verify that your magazine is fully inserted into the magwell. You will be able to hear an audible "click" when it is fully seated. Our receivers are designed to use a wide variety of double stack OEM Glock magazines. Some magazines will fit more snug than others or may have a break in period due to slight differences in the thickness of the magazines. It is normal to see slight wear on the magazine where the polymer comes in contact with the aluminum magazine stop of the receiver.
Aftermarket "Glock" magazines
We always recommend using factory OEM Glock double stack magazines. In our testing we have found they will always give you the best reliability. Aftermarket magazines can be used but we do not troubleshoot issues with aftermarket magazines.
Holding the magazine while shooting
We do not recommend holding or supporting the firearm by the magazine or magwell. Always place your support hand on the handguard when shooting the firearm.
Glock 33rd 4422-02 magazine fitment
Glock 33 round magazines labeled 4422-02 (on the back of the magazine) are .010 inches larger than other generation Glock 33 round magazines (e.g. 4422-01). This can prevent the magazine from being fully inserted into the magwell and latching with the magazine catch.
The following steps will allow you to use Glock 31/33 round 4422-02 magazines.
- Lock the bolt in the reward position.
- Insert the magazine with a snap cap. Make sure the magazine is latched, you may need to tilt the magazine forward slightly for it to latch. This will score the magazine stop location.
- Release and remove the magazine from the firearm. You should see the scoring right above the magazine stop.
- Using a sharp knife, chisel, or fine sandpaper, remove a small amount of material from the magazine. Go slowly and test fit often as you do not need to remove a lot of material.
The area circled in red below depicts the marks and where the magazine needs to be sanded down. This modification does not negatively impact the function of the magazine in a Glock handgun.