Long ago I bought a couple of Colt 1851 Navy replicas just for fun. I've shot them a few times and have had fun with the whole Wild West fantasy. However something has always bothered me. Just above where the loading lever attaches to the barrel a bit of the barrel has been machined away, thinning the wall of the barrel. I've really had no problem with the guns but I've noticed than many replicas have this little indent on the barrel. If it were at the barrel end I'd not be concerned but the indent is pretty near the forcing cone where pressures would naturally be highest. I've noticed many replicas have this little feature. Is this part of the original design or is this just sloppy machining on the part of the manufacturer? I wonder if enough barrel thickness is left to be safe especially with the non-historical 44 caliber Navy Colt.