Picked up an M&P Sport. New to ARs, not new to S&Ws. Mostly concerned that the lower is AR "common", which is what I have read. Hoping to make this a "varmint killer" to ride on my ATV.

Am planning the following upgrades:

• Magpul grip
• Timney 3 lb skeleton trigger
• maybe an accurizing wedge if needed

Was cruising Midway the other day and ran across a DPMS Flattop 16" bull barrel complete upper on sale for $350 w/ very good reviews. This will be sitting on top of my Sport lower as soon as it comes in. Topping it with a 4-12X40. Hope to have it all together in a day or two, then off to the range.