Converting a Glock 43X to a Glock 48 is extremely simple. Basically Glock 48 is just a long slide version of the Glock 43X. All you have to do is swap out the internal parts from the 43X slide and put it into a stripped Glock 48 slide, and then add the barrel.

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Here are some top Glock 48 slide options you can check out:

• FCD Glock 48 RMRcc Plate
  
• Zaffiri Precision Glock 48 RMSc Slide

Since slim frame Glock doesn't have firing pin channel liners, you can just swap all the parts from the Glock 43 to the 48 slide.

Here are some top Glock 48 barrel options you can check out:

• Zaffiri Precision Glock 48 Flush and Crown Barrel 
• Rival Arms Glock 48 Threaded Barrel
• True Precision Glock 48 Threaded Barrel
  
• Backup Tactical Glock 48 Threaded Barrel

If you want another set of slide parts including recoil rod, ejector, firing pin, trigger spring and all of it, you can get it here

FAQ

Do I need a new recoil spring for the Glock 48

No, the recoil spring on the Glock 43 will fit the Glock 48.

Do I need to buy a firing pin channel liner?

No. Slim frame Glocks don't have that.