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The X-Buster (エックスバスター)[1][2], officially designated as the Mega Buster Mk.17 (ロックバスターMk.17)[1], is a recurring weapon in the Mega Man franchise. It is a powerful arm-mounted buster wielded by X.
References
↑ 1.01.1Opening "Mega Man X Specifications", Mega Man X. 1993.