Thanks, I like to do a little research on the round and weapon before I buy it. I took me over a year to decide on what route to go with for my AR. And instead of buying a off the shelf one I built my own. My two baby's are my AR and Kimber.
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That's some time in deciding what route to go. I'd say you did some solid homework! I've been debating building an AR or waiting for a SCAR to come back in stock... it's a tough decision!
Talk about weird rounds, I've never heard of the 5.7 x 28. Looks like a .223 short?
It is definitely an interesting round. It's practically a mini .223. The 5.7 round is designed to have rifle-like ballistics. If I'm not mistaken, I believe this round has the highest velocity for a pistol cartridge. For the 5.7 to really shine, it needs to be placed into perspective for what platform it was made for, which is a full auto P90 with a 50 round magazine. Very low recoil, high velocity, and with the right versions (AP versions) are devastating. As a bonus, the Secret Service uses it!
Yeah, one of the variants of the Remington 870 has been in my sights while researching, but I have a feeling it's gonna be slippery slope; then it'll be a rifle for long distance, then a pistol to do three-gun competitions, then I'll need a second job to fund all of it... 
Alex, it truly is a slippery slope. One is definitely not enough!!! Before you know it, you'll be buying (or trying to buy) a new gun quarterly!
