I had a non hooded NM rear sight in before, it was not stoned, just square on the end. Then I took my NM stoned hooded rear from my standard abd installed it. When I put all the parts together it set flush on the rear of the receiver. Buy when I tighten it up it raises up about1/16" to 1/8". On my standard with any rear sight it always sits flush and the rear cover looks like it fits properly, how do I take the rear sight cover off without damaging it? I called Springfield and asked to talk to an Armorer and the lady said that they were in a meeting but she asked around and replied to me that some of the rear sight bases have gaps and others do not. She said it was totally normal and it will function fine and not to worry. I'll try to round up a digital camera and take some detailed photos. Do you think that a new sheet metal rear sight cover would do the trick? I wish I would have paid more attention to it prior to dissasemble. I know I got everything back in there right, I stripped down my standard USGI sight and reassembled it w/ no problems , I know the NM SA sight is different but noe that different. Let me know what you think...thanks Billy