Umm no, the KX3 and KX5 are different.
The KX3 was released quite a while before the NSR came out. The KX5 was introduced solely for the purpose of fitting inside the NSR.
http://www.shopnoveske.com/products/...w-crush-washer
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-You asked, we listened. New slim design allows installation under the Noveske Handguard-
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