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Discussion Starter · #1 ·
Hi Community,

New poster here. I own a P226 from Sig and am quite happy with it, so I'm looking to add an AR-15 to my collection and thought about sticking to Sig.

Back in 2013, someone had this exact question here: M400 Proprietary upper/lower?

The article was extremely helpful for me, but I wanted to check with the community since it was 7 years ago, and make sure that nothing has changed on the m400 tread since then that would make it hard to swap uppers.

My goal is to quickly be able to swap a complete 6.5 Grendel or 50 Beowulf for hunting, keeping my optics set on both for the different applications (home defense and maybe 3-gun, vs. hunting large game like dear or elk).
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