The instarifleaddon.zip file you have requested: Garry's Mod / Add-ons / Half-Life 2 Garry's Mod InstaRifle Addon - 2.58mb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:

new sweep for G-mod this can also fix the sound , effects and tool problems in some computers made by DSds

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