BCM was out of stock when I ordered my M4 stock, or else I would've gotten one there. Theres a ton of reviews on Midwayusa and cheaperthandirt from owners that claim thier new wrench either won't work, doesnt fit, broke, stripped, and/or bent. I am simply asking you guys who have the knowledge from actually owning these firearms, what tool/s you have that work well. My local gun shop has a DPMS tool that I was going to buy and try but I dont want to buy it, have it be a POS and then make a hassle with the retailer trying to return it, if I could have prevented it by asking first.