Fits Glock 43 and Glock 43X OEM frames. This sub-compact upper ships fully assembled at 3CR Tactical — drop it onto a completed Glock 43 lower and you have a working pistol ready for carry workups.

The slide wears a black nitride finish with front and rear serrations and is cut for the RMSc optic footprint (Holosun 507K, Shield RMSc, Sig Romeo Zero). A black nitride crown-cut 9mm barrel is installed from the factory, and the full 3CR Tactical slide completion kit is built in.

What’s installed:

• Front and rear serrated Glock 43 slide — RMSc optic cut
• Black nitride 9mm crown-cut barrel
• OEM-spec internals with dual-action recoil rod
• Standard-height polymer sights pre-installed

What you still need:

• RMSc-footprint optic if running a red dot (factory cover plate ships with the slide)
• Completed Glock 43 or 43X lower (frame, trigger assembly, magazine)

Lubricate the slide rails before the first session and run 100–200 rounds of factory 9mm to bed in the contact surfaces. Confirm the optic you mount uses the RMSc footprint — standard RMR optics will not seat on this cut.

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