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I have managed to find 5 Sig stripped lowers at $145 each, and $16.99 total S/H, and I am on the lookout for a few more.
I picked up a few spare Sig M400 stripped uppers at CDNN a while back at $59.99, so that still places a lot of value on the barrel to get even close to a $500 or more upper. I am not complaining. My bigger issue is how to prevent me and my kids from mistakenly swapping mags between the different calibers. My first attempt was using a label maker to make labels for the ejection port dust covers, but I didn't like that look. So, I am trying new covers, but not sure I like that look either. Rolling_trip , what do you think? The top two are 556 pistols (standard, black covers), the next two are 300 BLK/AAC, and the last one is a 762x39, just in case you can't read the covers.
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Those look awesome. These are the ones I bought.
https://davidsondefense.com/yankee-hill-yhm-dust-cover-assy-caliber-marked-300-blackout/