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JohnEP · October 14, 2012, 01:27 AM

mohr308,

My brother loaned me his Mossberg 702, as I agreed to free-float the barrel for him to see if it could be more accurate. After sanding all high-points off the stock, I took a bright light to the crown...

Yikes! The crown itself has a sharp lip that is pushed inward to be a smaller diameter than either the lands or grooves. Stroking a Q-tip out of the tip of the barrel catches threads.

After this lip, just inside the barrel, you can see the lands are ground away on 1 side of the barrel and not the other. In fact, these machining marks seem to dig even deeper than the grooves on this side of the barrel!

At first, I was tempted to lap the sharp lip off the crown. However, doing so would then further expose the asymmetrical rifling just below... At least the sharp lip seems to be a perfect circle!

How does YOUR crown look?

Also seeking advice from a wider audience: To lap, or not to lap... Any advice?

October 14, 2012, 01:27 AM	#22
JohnEP Junior Member Join Date: October 14, 2012 Posts: 2	Mossberg 702 crown is poorly machined mohr308, My brother loaned me his Mossberg 702, as I agreed to free-float the barrel for him to see if it could be more accurate. After sanding all high-points off the stock, I took a bright light to the crown... Yikes! The crown itself has a sharp lip that is pushed inward to be a smaller diameter than either the lands or grooves. Stroking a Q-tip out of the tip of the barrel catches threads. After this lip, just inside the barrel, you can see the lands are ground away on 1 side of the barrel and not the other. In fact, these machining marks seem to dig even deeper than the grooves on this side of the barrel! At first, I was tempted to lap the sharp lip off the crown. However, doing so would then further expose the asymmetrical rifling just below... At least the sharp lip seems to be a perfect circle! How does YOUR crown look? Also seeking advice from a wider audience: To lap, or not to lap... Any advice?