I'm still really new to the Clone world and have been trying to piece together an M110 and last august I tried purchasing one of Charlie's Potomac Armory M110 profile barrels. Well turns out they aren't making them at all and since December I have been trying to get a refund from them with zero results, just sporadic messages with excuses for why they haven't refunded me like "the boss is on vacation" or "he's at SHOT show" every time I message them.
I just wanted to put this message out to warn anyone else trying to buy M110 barrels from them for a clone that the hassle is not worth the 1500 bucks that you clearly won't get back. Just buy a knights or HTX concepts barrel and save the headache.