07-17-2020, 11:52 PM
Received my lapping tool today. It's the AR-Stoner version, BTW. The In-the-white piece. Won't fit in the receiver. At all. Not even a quarter inch. The way the tool is machined, it has a slight taper on the end, no doubt to help inserting it. But after riding up that a few mm, it gets stuck.
I don't know if it's worth the hassle of sending back. I don't have a lathe though, so turning it down wouldn't be super easy. I might be able to rig something with a drill, and clamp a center punch or something in my vice to go into the pilot hole on the other end, for a "spit roast" effect, and then just go at it with some Emery cloth until it slip into the receiver. One thing I obviously want to avoid is enlarging the bore on the upper receiver.
FWIW, it tried fitting it into my Grendel's upper and a spare Daniel Defense upper I have laying around. No go in either.
I don't know if it's worth the hassle of sending back. I don't have a lathe though, so turning it down wouldn't be super easy. I might be able to rig something with a drill, and clamp a center punch or something in my vice to go into the pilot hole on the other end, for a "spit roast" effect, and then just go at it with some Emery cloth until it slip into the receiver. One thing I obviously want to avoid is enlarging the bore on the upper receiver.
FWIW, it tried fitting it into my Grendel's upper and a spare Daniel Defense upper I have laying around. No go in either.