Gun sock for a tactical rifle

seems like the triad one is the ticket. "-RIFLE CONDOM will hold any weapon up to 49" overall length (Rem 700 SA with 28" barrel) and up to 13" tall (AR10/SR25 with large optic and 20 round magazine in place). "
 
The Triad ones work great. I've got them on big bolt guns and on smaller gas guns, all scoped and bipodded, with variable length mags. I use them to protect the rifles in my safe and they work fine from home to range. They'll also fit into the larger drag bags (I use Tac Ops) if you want additional protection
 
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SORD make a good one

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I use Bore Store socks. They keep them from rusting as well. They are well made, and rather inexpensive. They make them in different sizes and with or without scopes up to 60". Check them out at borestores.com