You don’t really need it on a 9mm carbine. Then, the forward assist has been left off. But this makes this upper receiver compatible with a broader spectrum of 9mm bolt carrier groups, since not all 9mm bolt carriers have a notch for the ejection port cover. It might seem like a bad idea to remove the ejection port cover. This improves the reliability of your 9mm AR-15, since it helps reduce ejection issues. And the ejection port cover has been removed to accommodate the way 9mm casings eject off the bolt face. The ejection port is slightly shorter and wider. They made the necessary changes and left off all the equipment you don’t need on a pistol caliber carbine. This upper is essentially a mil-spec AR-15 upper receiver that’s been modified for running 9mm. And the Rainier Arms Forged Mil-Spec Upper offers the same blend of quality and affordability as all their other parts. Rainier Arms has always produced excellent hardware for surprisingly low prices. You can check out our variety of AR 15 9mm complete upper kits via our clearance sale here. There are many benefits of using a 9mm AR upper receiver. Convert it into a AR 15 9mm upper, and the rate is halved! For your average AR model, the number is approximately 3.8 foot-pounds of recoil. The second benefit of using an AR15 9mm upper is that it’s a low-recoil shooter. You can run Glock mags with your PCC and 9mm upper AR mag up to 30 magazine rounds which are cheaper and easy to find in the gun shops. The main benefit of constructing your own PCC with an AR-15 9mm upper is that you can use ammo that’s largely available in the US, and that’s the almighty 9mm cartridge. Sure, you can change the triggers, finishes, optics, and lowers, but you’ll have to search the shops if you want to convert your kit with a 9mm AR-15 upper that actually runs 9mm bullets. Thanks to the 9mm AR pistol upper, the AR9 is much lighter in weight than a kit with an AR15 9mm complete upper. The difference between AR9 and AR-15 rifles is that most of the parts aren’t really interchangeable, as opposed to a common misconception. What is the Difference Between AR9 and AR-15? ![]()
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