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FYI. One word of caution...not all upper receivers are 100% interchangeable. Seems Colt has one set of sizes for the take down pins and other manufacturers have another. I had to get a special adapter take down pin to allow me to swap them out. It wasn't hard, just want you to be aware, as you may need to get an extra piece of gear to be able to mount it correctly. Best bet is to bring your lower reciever with you to the shop before you buy it. If you get it online, be prepared for it not to fit.
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