I recently purchased a new SA Ronin Operator 4.25 in .45ACP. After taking out to shoot the first time I have found the outside edges of the grip safety & frame are a bit sharp. After shooting 100 rnds through I developed a blister/cut on my thumb where the gun is fits in the webbing of my thumb/hand. I have never had this with any other 1911/handgun. After inspecting the gun the edges of the frame & grip safety have a very pronounced sharp edge. To fix this and not damage the look of the gun could I lightly ease the edges with some 400 or 600 grit sandpaper? Has anyone else had this problem? I have 2 other 1911's (Kimber & Remington), plus when I entered the service the 1911 was the service pistol we carried & qualified with. I have never had this happen with any other gun. I would appreciate any advice on this. Thanks