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K45UR-OR: 45 ACP Optics Ready Upper Receiver, 16"

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K45UR-OR Optics Ready

Availability: Available (built to order)


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Complete upper receiver assembly chambered in the classic 45ACP pistol round. Includes one 18 round polymer magazine with last round bolt hold open feature. Standard with Picatinny flat-top upper receiver, heavy barrel and picatinny gas block - ready for installation of your optics. 

Upper is 100% complete with bolt carrier assembly and charging handle. Ready to drop-on any standard AR15 lower receiver. Simply attach the upper and swap out to the 45 ACP magazine, and you are ready to shoot. Swap back and forth between calibers as fast as you can swap out the upper receiver and magazine.

This caliber conversion does not require the changing of hammers, triggers, buffers or buffer springs. No need to add in a magazine well adapter or mag well plug either. Designed to work with any standard, unmodified AR15 lower with A2 or collapsible stocks.

Other pistol calibers available: 9mm, 10mm and 40 S&W.

Don't forget extra magazines, and spare parts!

Muzzle threads: 5/8x24 tpi. 

All Olympic Arms pistol caliber carbines and upper conversions are BLOW-BACK operated, and are NOT a delayed direct gas impingement system. 

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Olympic Arms, Inc. is not affiliated with the IOC/USOC or any other Olympic sports organization.